20002121231 has 2 divisors, whose sum is σ = 20002121232. Its totient is φ = 20002121230.

The previous prime is 20002121203. The next prime is 20002121261. The reversal of 20002121231 is 13212120002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20002121231 is a prime.

It is a super-2 number, since 2×20002121231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20002121261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001060615 + 10001060616.

It is an arithmetic number, because the mean of its divisors is an integer number (10001060616).

Almost surely, 2^20002121231 is an apocalyptic number.

20002121231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002121231 is an equidigital number, since it uses as much as digits as its factorization.

20002121231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20002121231 its reverse (13212120002), we get a palindrome (33214241233).

The spelling of 20002121231 in words is "twenty billion, two million, one hundred twenty-one thousand, two hundred thirty-one".