21325370 has 32 divisors (see below), whose sum is σ = 43701120. Its totient is φ = 7416640.

The previous prime is 21325349. The next prime is 21325387. The reversal of 21325370 is 7352312.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1685 + ... + 6744.

It is an arithmetic number, because the mean of its divisors is an integer number (1365660).

Almost surely, 2^21325370 is an apocalyptic number.

21325370 is an abundant number, since it is smaller than the sum of its proper divisors (22375750).

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

21325370 is a wasteful number, since it uses less digits than its factorization.

21325370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8470.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 21325370 is about 4617.9400169340. The cubic root of 21325370 is about 277.3099962771.

Adding to 21325370 its reverse (7352312), we get a palindrome (28677682).

The spelling of 21325370 in words is "twenty-one million, three hundred twenty-five thousand, three hundred seventy".