21311010 has 48 divisors (see below), whose sum is σ = 63326016. Its totient is φ = 4870944.

The previous prime is 21310999. The next prime is 21311033. The reversal of 21311010 is 1011312.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21310983 and 21311001.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16284 + ... + 17543.

It is an arithmetic number, because the mean of its divisors is an integer number (1319292).

Almost surely, 2^21311010 is an apocalyptic number.

21311010 is an abundant number, since it is smaller than the sum of its proper divisors (42015006).

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

21311010 is a wasteful number, since it uses less digits than its factorization.

21311010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33847 (or 33844 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 21311010 is about 4616.3849492866. The cubic root of 21311010 is about 277.2477376353.

Adding to 21311010 its reverse (1011312), we get a palindrome (22322322).

The spelling of 21311010 in words is "twenty-one million, three hundred eleven thousand, ten".