21212210021202 has 48 divisors (see below), whose sum is σ = 47619661316760. Its totient is φ = 6818753926656.

The previous prime is 21212210021113. The next prime is 21212210021203. The reversal of 21212210021202 is 20212001221212.

It is a happy number.

21212210021202 is a `hidden beast` number, since 21 + 212 + 210 + 0 + 21 + 202 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 19151747865441 + 2060462155761 = 4376271^2 + 1435431^2 .

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 (21212210021203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 140854677 + ... + 141005192.

Almost surely, 2^{21212210021202} is an apocalyptic number.

21212210021202 is an abundant number, since it is smaller than the sum of its proper divisors (26407451295558).

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

21212210021202 is a wasteful number, since it uses less digits than its factorization.

21212210021202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281860027 (or 281860024 counting only the distinct ones).

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

Adding to 21212210021202 its reverse (20212001221212), we get a palindrome (41424211242414).

The spelling of 21212210021202 in words is "twenty-one trillion, two hundred twelve billion, two hundred ten million, twenty-one thousand, two hundred two".