21252039519 has 8 divisors (see below), whose sum is σ = 28363329280. Its totient is φ = 14154388056.

The previous prime is 21252039509. The next prime is 21252039559. The reversal of 21252039519 is 91593025212.

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

It is not a de Polignac number, because 21252039519 - 2⁹ = 21252039007 is a prime.

It is a super-2 number, since 2×21252039519² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252039509) 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, 3405937 + ... + 3412170.

It is an arithmetic number, because the mean of its divisors is an integer number (3545416160).

Almost surely, 2^21252039519 is an apocalyptic number.

21252039519 is a deficient number, since it is larger than the sum of its proper divisors (7111289761).

21252039519 is a wasteful number, since it uses less digits than its factorization.

21252039519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6819149.

The product of its (nonzero) digits is 48600, while the sum is 39.

The spelling of 21252039519 in words is "twenty-one billion, two hundred fifty-two million, thirty-nine thousand, five hundred nineteen".