21010531110 has 32 divisors (see below), whose sum is σ = 51063575040. Its totient is φ = 5531886048.

The previous prime is 21010531097. The next prime is 21010531111. The reversal of 21010531110 is 1113501012.

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 21010531110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010531111) 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, 4430232 + ... + 4434971.

It is an arithmetic number, because the mean of its divisors is an integer number (1595736720).

Almost surely, 2^21010531110 is an apocalyptic number.

21010531110 is an abundant number, since it is smaller than the sum of its proper divisors (30053043930).

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

21010531110 is a wasteful number, since it uses less digits than its factorization.

21010531110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8865292.

The product of its (nonzero) digits is 30, while the sum is 15.

The spelling of 21010531110 in words is "twenty-one billion, ten million, five hundred thirty-one thousand, one hundred ten".