21101123310 has 32 divisors (see below), whose sum is σ = 52011420192. Its totient is φ = 5474885760.

The previous prime is 21101123291. The next prime is 21101123317. The reversal of 21101123310 is 1332110112.

It is a happy number.

It is a super-2 number, since 2×21101123310² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21101123310.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101123317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9503901 + ... + 9506120.

It is an arithmetic number, because the mean of its divisors is an integer number (1625356881).

Almost surely, 2^21101123310 is an apocalyptic number.

21101123310 is an abundant number, since it is smaller than the sum of its proper divisors (30910296882).

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

21101123310 is a wasteful number, since it uses less digits than its factorization.

21101123310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19010068.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21101123310 its reverse (1332110112), we get a palindrome (22433233422).

The spelling of 21101123310 in words is "twenty-one billion, one hundred one million, one hundred twenty-three thousand, three hundred ten".