20401123331 has 2 divisors, whose sum is σ = 20401123332. Its totient is φ = 20401123330.

The previous prime is 20401123247. The next prime is 20401123373. The reversal of 20401123331 is 13332110402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20401123331 is a prime.

It is a super-2 number, since 2×20401123331² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20401123231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200561665 + 10200561666.

It is an arithmetic number, because the mean of its divisors is an integer number (10200561666).

Almost surely, 2^20401123331 is an apocalyptic number.

20401123331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401123331 is an equidigital number, since it uses as much as digits as its factorization.

20401123331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20401123331 its reverse (13332110402), we get a palindrome (33733233733).

The spelling of 20401123331 in words is "twenty billion, four hundred one million, one hundred twenty-three thousand, three hundred thirty-one".