20021011099998 has 64 divisors (see below), whose sum is σ = 43057200699648. Its totient is φ = 6183476006400.

The previous prime is 20021011099979. The next prime is 20021011100021. The reversal of 20021011099998 is 89999011012002.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20021011099998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9996673 + ... + 11831123.

It is an arithmetic number, because the mean of its divisors is an integer number (672768760932).

Almost surely, 2^{20021011099998} is an apocalyptic number.

20021011099998 is an abundant number, since it is smaller than the sum of its proper divisors (23036189599650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20021011099998 is a wasteful number, since it uses less digits than its factorization.

20021011099998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836137.

The product of its (nonzero) digits is 209952, while the sum is 51.

The spelling of 20021011099998 in words is "twenty trillion, twenty-one billion, eleven million, ninety-nine thousand, nine hundred ninety-eight".