21413370 has 96 divisors (see below), whose sum is σ = 59984064. Its totient is φ = 4871680.

The previous prime is 21413369. The next prime is 21413389. The reversal of 21413370 is 7331412.

21413370 = 5² + 6² + ... + 400².

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, 61537 + ... + 61883.

It is an arithmetic number, because the mean of its divisors is an integer number (624834).

Almost surely, 2^21413370 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21413370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29992032).

21413370 is an abundant number, since it is smaller than the sum of its proper divisors (38570694).

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

21413370 is a wasteful number, since it uses less digits than its factorization.

21413370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21413370 is about 4627.4582656141. The cubic root of 21413370 is about 277.6909164264.

Adding to 21413370 its reverse (7331412), we get a palindrome (28744782).

The spelling of 21413370 in words is "twenty-one million, four hundred thirteen thousand, three hundred seventy".