20000000121021 has 24 divisors (see below), whose sum is σ = 29959520485440. Its totient is φ = 13333034084832.

The previous prime is 20000000120999. The next prime is 20000000121083. The reversal of 20000000121021 is 12012100000002.

It is a de Polignac number, because none of the positive numbers 2^k-20000000121021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20000000120994 and 20000000121012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000000121091) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10197520 + ... + 11999558.

It is an arithmetic number, because the mean of its divisors is an integer number (1248313353560).

Almost surely, 2^{20000000121021} is an apocalyptic number.

It is an amenable number.

20000000121021 is a deficient number, since it is larger than the sum of its proper divisors (9959520364419).

20000000121021 is an equidigital number, since it uses as much as digits as its factorization.

20000000121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847727 (or 1847715 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20000000121021 its reverse (12012100000002), we get a palindrome (32012100121023).

The spelling of 20000000121021 in words is "twenty trillion, one hundred twenty-one thousand, twenty-one".