212001200021121 has 16 divisors (see below), whose sum is σ = 331780513805184. Its totient is φ = 117869393061504.

The previous prime is 212001200021113. The next prime is 212001200021159. The reversal of 212001200021121 is 121120002100212.

It is not a de Polignac number, because 212001200021121 - 2³ = 212001200021113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212001200021121.

It is not an unprimeable number, because it can be changed into a prime (212001200021111) 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, 136422907860 + ... + 136422909413.

It is an arithmetic number, because the mean of its divisors is an integer number (20736282112824).

Almost surely, 2^{212001200021121} is an apocalyptic number.

212001200021121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212001200021121 is a deficient number, since it is larger than the sum of its proper divisors (119779313784063).

212001200021121 is a wasteful number, since it uses less digits than its factorization.

212001200021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272845817320.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 212001200021121 its reverse (121120002100212), we get a palindrome (333121202121333).

The spelling of 212001200021121 in words is "two hundred twelve trillion, one billion, two hundred million, twenty-one thousand, one hundred twenty-one".