21232112310 has 64 divisors (see below), whose sum is σ = 56856038400. Its totient is φ = 5638189536.

The previous prime is 21232112309. The next prime is 21232112323. The reversal of 21232112310 is 1321123212.

21232112310 is a `hidden beast` number, since 21 + 2 + 321 + 12 + 310 = 666.

It is a super-2 number, since 2×21232112310² (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 congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99984 + ... + 229043.

It is an arithmetic number, because the mean of its divisors is an integer number (888375600).

Almost surely, 2^21232112310 is an apocalyptic number.

21232112310 is an abundant number, since it is smaller than the sum of its proper divisors (35623926090).

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

21232112310 is a wasteful number, since it uses less digits than its factorization.

21232112310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329282 (or 329276 counting only the distinct ones).

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

Adding to 21232112310 its reverse (1321123212), we get a palindrome (22553235522).

The spelling of 21232112310 in words is "twenty-one billion, two hundred thirty-two million, one hundred twelve thousand, three hundred ten".