21174215898 has 32 divisors (see below), whose sum is σ = 46368801792. Its totient is φ = 6392746800.

The previous prime is 21174215893. The next prime is 21174215917. The reversal of 21174215898 is 89851247112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21174215893) 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, 574036 + ... + 609807.

It is an arithmetic number, because the mean of its divisors is an integer number (1449025056).

Almost surely, 2^21174215898 is an apocalyptic number.

21174215898 is an abundant number, since it is smaller than the sum of its proper divisors (25194585894).

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

21174215898 is a wasteful number, since it uses less digits than its factorization.

21174215898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184130.

The product of its digits is 322560, while the sum is 48.

The spelling of 21174215898 in words is "twenty-one billion, one hundred seventy-four million, two hundred fifteen thousand, eight hundred ninety-eight".