21203031258 has 40 divisors (see below), whose sum is σ = 47534275008. Its totient is φ = 7064139816.

The previous prime is 21203031257. The next prime is 21203031277. The reversal of 21203031258 is 85213030212.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21203031257) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 302485 + ... + 365927.

Almost surely, 2^21203031258 is an apocalyptic number.

21203031258 is an abundant number, since it is smaller than the sum of its proper divisors (26331243750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21203031258 is a wasteful number, since it uses less digits than its factorization.

21203031258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65520 (or 65511 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 21203031258 in words is "twenty-one billion, two hundred three million, thirty-one thousand, two hundred fifty-eight".