21000010101012 has 36 divisors (see below), whose sum is σ = 53223420533920. Its totient is φ = 6981533696592.

The previous prime is 21000010101011. The next prime is 21000010101023. The reversal of 21000010101012 is 21010101000012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21000010100985 and 21000010101003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000010101011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 769555768 + ... + 769583055.

Almost surely, 2^{21000010101012} is an apocalyptic number.

It is an amenable number.

21000010101012 is an abundant number, since it is smaller than the sum of its proper divisors (32223410432908).

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

21000010101012 is a wasteful number, since it uses less digits than its factorization.

21000010101012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539139212 (or 1539139207 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21000010101012 its reverse (21010101000012), we get a palindrome (42010111101024).

The spelling of 21000010101012 in words is "twenty-one trillion, ten million, one hundred one thousand, twelve".