20000021121 has 40 divisors (see below), whose sum is σ = 30133158528. Its totient is φ = 13219200000.

The previous prime is 20000021051. The next prime is 20000021137. The reversal of 20000021121 is 12112000002.

It is not a de Polignac number, because 20000021121 - 2¹⁴ = 20000004737 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (20000021141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7838796 + ... + 7841346.

Almost surely, 2^20000021121 is an apocalyptic number.

It is an amenable number.

20000021121 is a deficient number, since it is larger than the sum of its proper divisors (10133137407).

20000021121 is a wasteful number, since it uses less digits than its factorization.

20000021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3355 (or 3346 counting only the distinct ones).

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

Adding to 20000021121 its reverse (12112000002), we get a palindrome (32112021123).

The spelling of 20000021121 in words is "twenty billion, twenty-one thousand, one hundred twenty-one".