21337470 has 96 divisors (see below), whose sum is σ = 69189120. Its totient is φ = 4432320.

The previous prime is 21337457. The next prime is 21337471. The reversal of 21337470 is 7473312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21337471) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5391 + ... + 8469.

It is an arithmetic number, because the mean of its divisors is an integer number (720720).

Almost surely, 2^21337470 is an apocalyptic number.

21337470 is the 2310-th decagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21337470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34594560).

21337470 is an abundant number, since it is smaller than the sum of its proper divisors (47851650).

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

21337470 is a wasteful number, since it uses less digits than its factorization.

21337470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3110 (or 3107 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 21337470 is about 4619.2499391135. The cubic root of 21337470 is about 277.3624348597.

It can be divided in two parts, 213374 and 70, that added together give a square (213444 = 462²).

The spelling of 21337470 in words is "twenty-one million, three hundred thirty-seven thousand, four hundred seventy".