201212122022121 has 16 divisors (see below), whose sum is σ = 306772298434944. Its totient is φ = 114917098969344.

The previous prime is 201212122022059. The next prime is 201212122022137. The reversal of 201212122022121 is 121220221212102.

It is not a de Polignac number, because 201212122022121 - 2²⁷ = 201211987804393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (201212122022321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2552312640 + ... + 2552391473.

It is an arithmetic number, because the mean of its divisors is an integer number (19173268652184).

Almost surely, 2^{201212122022121} is an apocalyptic number.

201212122022121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201212122022121 is a deficient number, since it is larger than the sum of its proper divisors (105560176412823).

201212122022121 is a wasteful number, since it uses less digits than its factorization.

201212122022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5104706000.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 201212122022121 its reverse (121220221212102), we get a palindrome (322432343234223).

The spelling of 201212122022121 in words is "two hundred one trillion, two hundred twelve billion, one hundred twenty-two million, twenty-two thousand, one hundred twenty-one".