21020012022012 has 48 divisors (see below), whose sum is σ = 50524143331200. Its totient is φ = 6797793780288.

The previous prime is 21020012022007. The next prime is 21020012022017. The reversal of 21020012022012 is 21022021002012.

It is an interprime number because it is at equal distance from previous prime (21020012022007) and next prime (21020012022017).

It is a junction number, because it is equal to n+sod(n) for n = 21020012021982 and 21020012022000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020012022017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136622638 + ... + 136776405.

It is an arithmetic number, because the mean of its divisors is an integer number (1052586319400).

Almost surely, 2^{21020012022012} is an apocalyptic number.

It is an amenable number.

21020012022012 is an abundant number, since it is smaller than the sum of its proper divisors (29504131309188).

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

21020012022012 is a wasteful number, since it uses less digits than its factorization.

21020012022012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273399242 (or 273399240 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21020012022012 its reverse (21022021002012), we get a palindrome (42042033024024).

The spelling of 21020012022012 in words is "twenty-one trillion, twenty billion, twelve million, twenty-two thousand, twelve".