21012121022202 has 32 divisors (see below), whose sum is σ = 46706834092800. Its totient is φ = 7002055567584.

The previous prime is 21012121022197. The next prime is 21012121022213. The reversal of 21012121022202 is 20222012121012.

It is a happy number.

21012121022202 is a `hidden beast` number, since 210 + 1 + 21 + 210 + 2 + 220 + 2 = 666.

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 15 ways as a sum of consecutive naturals, for example, 54940258 + ... + 55321389.

It is an arithmetic number, because the mean of its divisors is an integer number (1459588565400).

Almost surely, 2^{21012121022202} is an apocalyptic number.

21012121022202 is an abundant number, since it is smaller than the sum of its proper divisors (25694713070598).

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

21012121022202 is a wasteful number, since it uses less digits than its factorization.

21012121022202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110265187 (or 110265181 counting only the distinct ones).

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

Adding to 21012121022202 its reverse (20222012121012), we get a palindrome (41234133143214).

The spelling of 21012121022202 in words is "twenty-one trillion, twelve billion, one hundred twenty-one million, twenty-two thousand, two hundred two".