21701372 has 24 divisors (see below), whose sum is σ = 47349120. Its totient is φ = 8454960.

The previous prime is 21701371. The next prime is 21701377. The reversal of 21701372 is 27310712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21701371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34922 + ... + 35537.

It is an arithmetic number, because the mean of its divisors is an integer number (1972880).

Almost surely, 2^21701372 is an apocalyptic number.

21701372 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21701372 is an abundant number, since it is smaller than the sum of its proper divisors (25647748).

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

21701372 is a wasteful number, since it uses less digits than its factorization.

21701372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70481 (or 70479 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 21701372 is about 4658.4731404184. The cubic root of 21701372 is about 278.9303235093.

The spelling of 21701372 in words is "twenty-one million, seven hundred one thousand, three hundred seventy-two".