221021200010121 has 32 divisors (see below), whose sum is σ = 337946562809856. Its totient is φ = 125865862968000.

The previous prime is 221021200010099. The next prime is 221021200010141. The reversal of 221021200010121 is 121010002120122.

It is not a de Polignac number, because 221021200010121 - 2³⁰ = 221020126268297 is a prime.

It is a super-2 number, since 2×221021200010121² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221021200010121.

It is not an unprimeable number, because it can be changed into a prime (221021200010141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28338691 + ... + 35286311.

It is an arithmetic number, because the mean of its divisors is an integer number (10560830087808).

Almost surely, 2^{221021200010121} is an apocalyptic number.

221021200010121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221021200010121 is a deficient number, since it is larger than the sum of its proper divisors (116925362799735).

221021200010121 is a wasteful number, since it uses less digits than its factorization.

221021200010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6952813.

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

Adding to 221021200010121 its reverse (121010002120122), we get a palindrome (342031202130243).

The spelling of 221021200010121 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred million, ten thousand, one hundred twenty-one".