21031431000158 has 4 divisors (see below), whose sum is σ = 31547146500240. Its totient is φ = 10515715500078.

The previous prime is 21031431000157. The next prime is 21031431000193. The reversal of 21031431000158 is 85100013413012.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21031431000158.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031431000157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5257857750038 + ... + 5257857750041.

It is an arithmetic number, because the mean of its divisors is an integer number (7886786625060).

Almost surely, 2^{21031431000158} is an apocalyptic number.

21031431000158 is a deficient number, since it is larger than the sum of its proper divisors (10515715500082).

21031431000158 is a wasteful number, since it uses less digits than its factorization.

21031431000158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10515715500081.

The product of its (nonzero) digits is 2880, while the sum is 29.

The spelling of 21031431000158 in words is "twenty-one trillion, thirty-one billion, four hundred thirty-one million, one hundred fifty-eight", and thus it is an aban number.