21010121110 has 32 divisors (see below), whose sum is σ = 41264370432. Its totient is φ = 7638538080.

The previous prime is 21010120951. The next prime is 21010121137. The reversal of 21010121110 is 1112101012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 648927 + ... + 680533.

It is an arithmetic number, because the mean of its divisors is an integer number (1289511576).

Almost surely, 2^21010121110 is an apocalyptic number.

21010121110 is a deficient number, since it is larger than the sum of its proper divisors (20254249322).

21010121110 is a wasteful number, since it uses less digits than its factorization.

21010121110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37668.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21010121110 its reverse (1112101012), we get a palindrome (22122222122).

The spelling of 21010121110 in words is "twenty-one billion, ten million, one hundred twenty-one thousand, one hundred ten".