20100021999 has 8 divisors (see below), whose sum is σ = 27453688752. Its totient is φ = 13073184960.

The previous prime is 20100021983. The next prime is 20100022009. The reversal of 20100021999 is 99912000102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20100021999 - 2⁴ = 20100021983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100021959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81707284 + ... + 81707529.

It is an arithmetic number, because the mean of its divisors is an integer number (3431711094).

Almost surely, 2^20100021999 is an apocalyptic number.

20100021999 is a deficient number, since it is larger than the sum of its proper divisors (7353666753).

20100021999 is a wasteful number, since it uses less digits than its factorization.

20100021999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163414857.

The product of its (nonzero) digits is 2916, while the sum is 33.

The spelling of 20100021999 in words is "twenty billion, one hundred million, twenty-one thousand, nine hundred ninety-nine".