21220133231999 has 4 divisors (see below), whose sum is σ = 22852451172936. Its totient is φ = 19587815291064.

The previous prime is 21220133231959. The next prime is 21220133232013. The reversal of 21220133231999 is 99913233102212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220133231999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220133231959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816158970449 + ... + 816158970474.

It is an arithmetic number, because the mean of its divisors is an integer number (5713112793234).

Almost surely, 2^{21220133231999} is an apocalyptic number.

21220133231999 is a deficient number, since it is larger than the sum of its proper divisors (1632317940937).

21220133231999 is a wasteful number, since it uses less digits than its factorization.

21220133231999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632317940936.

The product of its (nonzero) digits is 314928, while the sum is 47.

The spelling of 21220133231999 in words is "twenty-one trillion, two hundred twenty billion, one hundred thirty-three million, two hundred thirty-one thousand, nine hundred ninety-nine".