20990919100321 has 16 divisors (see below), whose sum is σ = 21685044215808. Its totient is φ = 20297862723600.

The previous prime is 20990919100199. The next prime is 20990919100337. The reversal of 20990919100321 is 12300191909902.

It is a cyclic number.

It is not a de Polignac number, because 20990919100321 - 2²⁹ = 20990382229409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20990919100421) 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, 209643156 + ... + 209743258.

It is an arithmetic number, because the mean of its divisors is an integer number (1355315263488).

Almost surely, 2^{20990919100321} is an apocalyptic number.

It is an amenable number.

20990919100321 is a deficient number, since it is larger than the sum of its proper divisors (694125115487).

20990919100321 is a wasteful number, since it uses less digits than its factorization.

20990919100321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105372.

The product of its (nonzero) digits is 78732, while the sum is 46.

The spelling of 20990919100321 in words is "twenty trillion, nine hundred ninety billion, nine hundred nineteen million, one hundred thousand, three hundred twenty-one".