20404221999 has 32 divisors (see below), whose sum is σ = 32967559680. Its totient is φ = 10965238272.

The previous prime is 20404221997. The next prime is 20404222031. The reversal of 20404221999 is 99912240402.

It is not a de Polignac number, because 20404221999 - 2¹ = 20404221997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20404221999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404221997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131974 + ... + 241299.

It is an arithmetic number, because the mean of its divisors is an integer number (1030236240).

Almost surely, 2^20404221999 is an apocalyptic number.

20404221999 is a deficient number, since it is larger than the sum of its proper divisors (12563337681).

20404221999 is a wasteful number, since it uses less digits than its factorization.

20404221999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373439.

The product of its (nonzero) digits is 93312, while the sum is 42.

The spelling of 20404221999 in words is "twenty billion, four hundred four million, two hundred twenty-one thousand, nine hundred ninety-nine".