21252220474 has 8 divisors (see below), whose sum is σ = 31883592960. Its totient is φ = 10624356156.

The previous prime is 21252220463. The next prime is 21252220519. The reversal of 21252220474 is 47402225212.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 861844 + ... + 886159.

It is an arithmetic number, because the mean of its divisors is an integer number (3985449120).

Almost surely, 2^21252220474 is an apocalyptic number.

21252220474 is a deficient number, since it is larger than the sum of its proper divisors (10631372486).

21252220474 is a wasteful number, since it uses less digits than its factorization.

21252220474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754084.

The product of its (nonzero) digits is 17920, while the sum is 31.

Adding to 21252220474 its reverse (47402225212), we get a palindrome (68654445686).

The spelling of 21252220474 in words is "twenty-one billion, two hundred fifty-two million, two hundred twenty thousand, four hundred seventy-four".