126821431 has 12 divisors (see below), whose sum is σ = 139675536. Its totient is φ = 115063520.

The previous prime is 126821399. The next prime is 126821467. The reversal of 126821431 is 134128621.

It is not a de Polignac number, because 126821431 - 2⁵ = 126821399 is a prime.

It is a super-2 number, since 2×126821431² = 32167350721775522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 126821431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126825431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103086 + ... + 104308.

It is an arithmetic number, because the mean of its divisors is an integer number (11639628).

Almost surely, 2^126821431 is an apocalyptic number.

126821431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

126821431 is a deficient number, since it is larger than the sum of its proper divisors (12854105).

126821431 is a wasteful number, since it uses less digits than its factorization.

126821431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102 (or 2091 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 126821431 is about 11261.5021644539. The cubic root of 126821431 is about 502.4168732902.

The spelling of 126821431 in words is "one hundred twenty-six million, eight hundred twenty-one thousand, four hundred thirty-one".