21229125458 has 18 divisors (see below), whose sum is σ = 32046177189. Its totient is φ = 10547492152.

The previous prime is 21229125443. The next prime is 21229125493. The reversal of 21229125458 is 85452192212.

It can be written as a sum of positive squares in 2 ways, for example, as 15877764049 + 5351361409 = 126007^2 + 73153^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=103027.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 55428335 + ... + 55428717.

Almost surely, 2^21229125458 is an apocalyptic number.

21229125458 is a deficient number, since it is larger than the sum of its proper divisors (10817051731).

21229125458 is an frugal number, since it uses more digits than its factorization.

21229125458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306 (or 654 counting only the distinct ones).

The product of its digits is 115200, while the sum is 41.

The spelling of 21229125458 in words is "twenty-one billion, two hundred twenty-nine million, one hundred twenty-five thousand, four hundred fifty-eight".