21101021012110 has 32 divisors (see below), whose sum is σ = 40903722931680. Its totient is φ = 7791107119488.

The previous prime is 21101021012101. The next prime is 21101021012129. The reversal of 21101021012110 is 1121012010112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

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, 44942629 + ... + 45409711.

It is an arithmetic number, because the mean of its divisors is an integer number (1278241341615).

Almost surely, 2^{21101021012110} is an apocalyptic number.

21101021012110 is a deficient number, since it is larger than the sum of its proper divisors (19802701919570).

21101021012110 is a wasteful number, since it uses less digits than its factorization.

21101021012110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814612.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21101021012110 its reverse (1121012010112), we get a palindrome (22222033022222).

The spelling of 21101021012110 in words is "twenty-one trillion, one hundred one billion, twenty-one million, twelve thousand, one hundred ten".