31146043421 has 4 divisors (see below), whose sum is σ = 31166023200. Its totient is φ = 31126063644.

The previous prime is 31146043393. The next prime is 31146043429. The reversal of 31146043421 is 12434064113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12434064113 = 19 ⋅654424427.

It is a cyclic number.

It is not a de Polignac number, because 31146043421 - 2²² = 31141849117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31146043429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9987551 + ... + 9990668.

It is an arithmetic number, because the mean of its divisors is an integer number (7791505800).

Almost surely, 2^31146043421 is an apocalyptic number.

It is an amenable number.

31146043421 is a deficient number, since it is larger than the sum of its proper divisors (19979779).

31146043421 is a wasteful number, since it uses less digits than its factorization.

31146043421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19979778.

The product of its (nonzero) digits is 6912, while the sum is 29.

The spelling of 31146043421 in words is "thirty-one billion, one hundred forty-six million, forty-three thousand, four hundred twenty-one".