21201002122212 has 108 divisors (see below), whose sum is σ = 58908530274048. Its totient is φ = 6424300000800.

The previous prime is 21201002122193. The next prime is 21201002122231. The reversal of 21201002122212 is 21222120010212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21201002122193) and next prime (21201002122231).

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 35 ways as a sum of consecutive naturals, for example, 136661673 + ... + 136816719.

Almost surely, 2^{21201002122212} is an apocalyptic number.

21201002122212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21201002122212 is an abundant number, since it is smaller than the sum of its proper divisors (37707528151836).

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

21201002122212 is a wasteful number, since it uses less digits than its factorization.

21201002122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186470 (or 186454 counting only the distinct ones).

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

Adding to 21201002122212 its reverse (21222120010212), we get a palindrome (42423122132424).

The spelling of 21201002122212 in words is "twenty-one trillion, two hundred one billion, two million, one hundred twenty-two thousand, two hundred twelve".