21221121199 has 16 divisors (see below), whose sum is σ = 22956742656. Its totient is φ = 19539990400.

The previous prime is 21221121167. The next prime is 21221121241. The reversal of 21221121199 is 99112112212.

It is not a de Polignac number, because 21221121199 - 2⁵ = 21221121167 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21221121199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221121149) 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, 3121494 + ... + 3128284.

It is an arithmetic number, because the mean of its divisors is an integer number (1434796416).

Almost surely, 2^21221121199 is an apocalyptic number.

21221121199 is a deficient number, since it is larger than the sum of its proper divisors (1735621457).

21221121199 is a wasteful number, since it uses less digits than its factorization.

21221121199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10766.

The product of its digits is 1296, while the sum is 31.

The spelling of 21221121199 in words is "twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred ninety-nine".