21002100020999 has 8 divisors (see below), whose sum is σ = 21011366289312. Its totient is φ = 20992834737280.

The previous prime is 21002100020987. The next prime is 21002100021047. The reversal of 21002100020999 is 99902000120012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002100020999 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 (21002100020959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44184947 + ... + 44657739.

It is an arithmetic number, because the mean of its divisors is an integer number (2626420786164).

Almost surely, 2^{21002100020999} is an apocalyptic number.

21002100020999 is a deficient number, since it is larger than the sum of its proper divisors (9266268313).

21002100020999 is a wasteful number, since it uses less digits than its factorization.

21002100020999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492297.

The product of its (nonzero) digits is 5832, while the sum is 35.

The spelling of 21002100020999 in words is "twenty-one trillion, two billion, one hundred million, twenty thousand, nine hundred ninety-nine".