21213122310 has 48 divisors (see below), whose sum is σ = 56644778736. Its totient is φ = 5503944384.

The previous prime is 21213122303. The next prime is 21213122407. The reversal of 21213122310 is 1322131212.

21213122310 is a `hidden beast` number, since 2 + 121 + 312 + 231 + 0 = 666.

It is a super-2 number, since 2×21213122310² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

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, 3181824 + ... + 3188483.

It is an arithmetic number, because the mean of its divisors is an integer number (1180099557).

Almost surely, 2^21213122310 is an apocalyptic number.

21213122310 is an abundant number, since it is smaller than the sum of its proper divisors (35431656426).

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

21213122310 is a wasteful number, since it uses less digits than its factorization.

21213122310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6370357 (or 6370354 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21213122310 its reverse (1322131212), we get a palindrome (22535253522).

The spelling of 21213122310 in words is "twenty-one billion, two hundred thirteen million, one hundred twenty-two thousand, three hundred ten".