21101020101012 has 24 divisors (see below), whose sum is σ = 49239532724256. Its totient is φ = 7033127773408.

The previous prime is 21101020100879. The next prime is 21101020101043. The reversal of 21101020101012 is 21010102010112.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 68038038 + ... + 68347469.

It is an arithmetic number, because the mean of its divisors is an integer number (2051647196844).

Almost surely, 2^{21101020101012} is an apocalyptic number.

It is an amenable number.

21101020101012 is an abundant number, since it is smaller than the sum of its proper divisors (28138512623244).

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

21101020101012 is a wasteful number, since it uses less digits than its factorization.

21101020101012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136398407 (or 136398405 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21101020101012 its reverse (21010102010112), we get a palindrome (42111122111124).

The spelling of 21101020101012 in words is "twenty-one trillion, one hundred one billion, twenty million, one hundred one thousand, twelve".