21012022220202 has 24 divisors (see below), whose sum is σ = 49028051847684. Its totient is φ = 6465237606144.

The previous prime is 21012022220171. The next prime is 21012022220209. The reversal of 21012022220202 is 20202222021012.

21012022220202 is a `hidden beast` number, since 210 + 12 + 0 + 22 + 220 + 202 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21011598313281 + 423906921 = 4583841^2 + 20589^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21012022220209) 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, 44897483143 + ... + 44897483610.

Almost surely, 2^{21012022220202} is an apocalyptic number.

21012022220202 is an abundant number, since it is smaller than the sum of its proper divisors (28016029627482).

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

21012022220202 is a wasteful number, since it uses less digits than its factorization.

21012022220202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89794966774 (or 89794966771 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21012022220202 its reverse (20202222021012), we get a palindrome (41214244241214).

The spelling of 21012022220202 in words is "twenty-one trillion, twelve billion, twenty-two million, two hundred twenty thousand, two hundred two".