21239054498 has 4 divisors (see below), whose sum is σ = 31858581750. Its totient is φ = 10619527248.

The previous prime is 21239054387. The next prime is 21239054503. The reversal of 21239054498 is 89445093212.

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., 21128657449 + 110397049 = 145357^2 + 10507^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5309763623 + ... + 5309763626.

Almost surely, 2^21239054498 is an apocalyptic number.

21239054498 is a deficient number, since it is larger than the sum of its proper divisors (10619527252).

21239054498 is a wasteful number, since it uses less digits than its factorization.

21239054498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10619527251.

The product of its (nonzero) digits is 622080, while the sum is 47.

The spelling of 21239054498 in words is "twenty-one billion, two hundred thirty-nine million, fifty-four thousand, four hundred ninety-eight".