21610915498 has 4 divisors (see below), whose sum is σ = 32416373250. Its totient is φ = 10805457748.

The previous prime is 21610915481. The next prime is 21610915531. The reversal of 21610915498 is 89451901612.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 12420433809 + 9190481689 = 111447^2 + 95867^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5402728873 + ... + 5402728876.

Almost surely, 2^21610915498 is an apocalyptic number.

21610915498 is a deficient number, since it is larger than the sum of its proper divisors (10805457752).

21610915498 is a wasteful number, since it uses less digits than its factorization.

21610915498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10805457751.

The product of its (nonzero) digits is 155520, while the sum is 46.

The spelling of 21610915498 in words is "twenty-one billion, six hundred ten million, nine hundred fifteen thousand, four hundred ninety-eight".