221000002022121 has 32 divisors (see below), whose sum is σ = 345230537591808. Its totient is φ = 123120836516160.

The previous prime is 221000002022117. The next prime is 221000002022123. The reversal of 221000002022121 is 121220200000122.

It is not a de Polignac number, because 221000002022121 - 2² = 221000002022117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221000002022121.

It is not an unprimeable number, because it can be changed into a prime (221000002022123) 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, 225703491 + ... + 226680536.

It is an arithmetic number, because the mean of its divisors is an integer number (10788454299744).

Almost surely, 2^{221000002022121} is an apocalyptic number.

221000002022121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221000002022121 is a deficient number, since it is larger than the sum of its proper divisors (124230535569687).

221000002022121 is a wasteful number, since it uses less digits than its factorization.

221000002022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452384621.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221000002022121 its reverse (121220200000122), we get a palindrome (342220202022243).

The spelling of 221000002022121 in words is "two hundred twenty-one trillion, two million, twenty-two thousand, one hundred twenty-one".