21239054497 has 8 divisors (see below), whose sum is σ = 21486481632. Its totient is φ = 20992920000.

The previous prime is 21239054387. The next prime is 21239054503. The reversal of 21239054497 is 79445093212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21239054497 - 2¹⁵ = 21239021729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21239054797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290088 + ... + 355849.

It is an arithmetic number, because the mean of its divisors is an integer number (2685810204).

Almost surely, 2^21239054497 is an apocalyptic number.

It is an amenable number.

21239054497 is a deficient number, since it is larger than the sum of its proper divisors (247427135).

21239054497 is a wasteful number, since it uses less digits than its factorization.

21239054497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646319.

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 21239054497 in words is "twenty-one billion, two hundred thirty-nine million, fifty-four thousand, four hundred ninety-seven".