20401421431 has 2 divisors, whose sum is σ = 20401421432. Its totient is φ = 20401421430.

The previous prime is 20401421419. The next prime is 20401421519. The reversal of 20401421431 is 13412410402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20401421431 - 2¹⁵ = 20401388663 is a prime.

It is a super-2 number, since 2×20401421431² (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 (20401424431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200710715 + 10200710716.

It is an arithmetic number, because the mean of its divisors is an integer number (10200710716).

Almost surely, 2^20401421431 is an apocalyptic number.

20401421431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401421431 is an equidigital number, since it uses as much as digits as its factorization.

20401421431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 20401421431 its reverse (13412410402), we get a palindrome (33813831833).

The spelling of 20401421431 in words is "twenty billion, four hundred one million, four hundred twenty-one thousand, four hundred thirty-one".