21012020110 has 16 divisors (see below), whose sum is σ = 37829385936. Its totient is φ = 8403085888.

The previous prime is 21012020059. The next prime is 21012020119. The reversal of 21012020110 is 1102021012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012020119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163432 + ... + 262171.

It is an arithmetic number, because the mean of its divisors is an integer number (2364336621).

Almost surely, 2^21012020110 is an apocalyptic number.

21012020110 is a deficient number, since it is larger than the sum of its proper divisors (16817365826).

21012020110 is a wasteful number, since it uses less digits than its factorization.

21012020110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430547.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21012020110 its reverse (1102021012), we get a palindrome (22114041122).

The spelling of 21012020110 in words is "twenty-one billion, twelve million, twenty thousand, one hundred ten".