21224525884 has 12 divisors (see below), whose sum is σ = 37143976464. Its totient is φ = 10611961184.

The previous prime is 21224525869. The next prime is 21224525911. The reversal of 21224525884 is 48852542212.

It is a self number, because there is not a number n which added to its sum of digits gives 21224525884.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175737 + ... + 270799.

It is an arithmetic number, because the mean of its divisors is an integer number (3095331372).

Almost surely, 2^21224525884 is an apocalyptic number.

It is an amenable number.

21224525884 is a deficient number, since it is larger than the sum of its proper divisors (15919450580).

21224525884 is a wasteful number, since it uses less digits than its factorization.

21224525884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150884 (or 150882 counting only the distinct ones).

The product of its digits is 409600, while the sum is 43.

The spelling of 21224525884 in words is "twenty-one billion, two hundred twenty-four million, five hundred twenty-five thousand, eight hundred eighty-four".