21479700 has 144 divisors (see below), whose sum is σ = 70995456. Its totient is φ = 4963200.

The previous prime is 21479693. The next prime is 21479729. The reversal of 21479700 is 797412.

It is a super-2 number, since 2×21479700² = 922755024180000, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 75759 + ... + 76041.

It is an arithmetic number, because the mean of its divisors is an integer number (493024).

Almost surely, 2^21479700 is an apocalyptic number.

21479700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21479700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35497728).

21479700 is an abundant number, since it is smaller than the sum of its proper divisors (49515756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21479700 is a wasteful number, since it uses less digits than its factorization.

21479700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 21479700 is about 4634.6197255007. The cubic root of 21479700 is about 277.9773457723.

The spelling of 21479700 in words is "twenty-one million, four hundred seventy-nine thousand, seven hundred".