21012122021202 has 80 divisors (see below), whose sum is σ = 50789973409560. Its totient is φ = 6454365285888.

The previous prime is 21012122021167. The next prime is 21012122021333. The reversal of 21012122021202 is 20212022121012.

It is a happy number.

21012122021202 is a `hidden beast` number, since 210 + 1 + 21 + 220 + 212 + 0 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 16206332952681 + 4805789068521 = 4025709^2 + 2192211^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7163677 + ... + 9661392.

Almost surely, 2^{21012122021202} is an apocalyptic number.

21012122021202 is an abundant number, since it is smaller than the sum of its proper divisors (29777851388358).

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

21012122021202 is a wasteful number, since it uses less digits than its factorization.

21012122021202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16825689 (or 16825680 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21012122021202 its reverse (20212022121012), we get a palindrome (41224144142214).

The spelling of 21012122021202 in words is "twenty-one trillion, twelve billion, one hundred twenty-two million, twenty-one thousand, two hundred two".