21020102012 has 24 divisors (see below), whose sum is σ = 45274066656. Its totient is φ = 8315644608.

The previous prime is 21020102009. The next prime is 21020102041.

It is a happy number.

21020102012 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 21020101984 and 21020102002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28873403 + ... + 28874130.

It is an arithmetic number, because the mean of its divisors is an integer number (1886419444).

Almost surely, 2^21020102012 is an apocalyptic number.

It is an amenable number.

21020102012 is an abundant number, since it is smaller than the sum of its proper divisors (24253964644).

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

21020102012 is a wasteful number, since it uses less digits than its factorization.

21020102012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57747557 (or 57747555 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Multiplying 21020102012 by its sum of digits (11), we get a palindrome (231221122132).

The spelling of 21020102012 in words is "twenty-one billion, twenty million, one hundred two thousand, twelve".