21140431431 has 16 divisors (see below), whose sum is σ = 33253152768. Its totient is φ = 11690560800.

The previous prime is 21140431427. The next prime is 21140431457. The reversal of 21140431431 is 13413404112.

It is not a de Polignac number, because 21140431431 - 2² = 21140431427 is a prime.

It is a super-2 number, since 2×21140431431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140431471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16236240 + ... + 16237541.

It is an arithmetic number, because the mean of its divisors is an integer number (2078322048).

Almost surely, 2^21140431431 is an apocalyptic number.

21140431431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21140431431 is a deficient number, since it is larger than the sum of its proper divisors (12112721337).

21140431431 is a wasteful number, since it uses less digits than its factorization.

21140431431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32473822.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21140431431 its reverse (13413404112), we get a palindrome (34553835543).

The spelling of 21140431431 in words is "twenty-one billion, one hundred forty million, four hundred thirty-one thousand, four hundred thirty-one".