20000121331 has 4 divisors (see below), whose sum is σ = 20003782464. Its totient is φ = 19996460200.

The previous prime is 20000121299. The next prime is 20000121371. The reversal of 20000121331 is 13312100002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20000121331 - 2⁵ = 20000121299 is a prime.

It is a super-2 number, since 2×20000121331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20000121371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1822360 + ... + 1833301.

It is an arithmetic number, because the mean of its divisors is an integer number (5000945616).

Almost surely, 2^20000121331 is an apocalyptic number.

20000121331 is a deficient number, since it is larger than the sum of its proper divisors (3661133).

20000121331 is an equidigital number, since it uses as much as digits as its factorization.

20000121331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661132.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 20000121331 its reverse (13312100002), we get a palindrome (33312221333).

The spelling of 20000121331 in words is "twenty billion, one hundred twenty-one thousand, three hundred thirty-one".