21111210031110 has 16 divisors (see below), whose sum is σ = 50666904074736. Its totient is φ = 5629656008288.

The previous prime is 21111210031081. The next prime is 21111210031133. The reversal of 21111210031110 is 1113001211112.

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 21111210031110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351853500489 + ... + 351853500548.

It is an arithmetic number, because the mean of its divisors is an integer number (3166681504671).

Almost surely, 2^{21111210031110} is an apocalyptic number.

21111210031110 is an abundant number, since it is smaller than the sum of its proper divisors (29555694043626).

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

21111210031110 is a wasteful number, since it uses less digits than its factorization.

21111210031110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703707001047.

The product of its (nonzero) digits is 12, while the sum is 15.

Adding to 21111210031110 its reverse (1113001211112), we get a palindrome (22224211242222).

The spelling of 21111210031110 in words is "twenty-one trillion, one hundred eleven billion, two hundred ten million, thirty-one thousand, one hundred ten".