21425018284 has 36 divisors (see below), whose sum is σ = 38270293600. Its totient is φ = 10495068480.

The previous prime is 21425018249. The next prime is 21425018297. The reversal of 21425018284 is 48281052412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13830742 + ... + 13832290.

Almost surely, 2^21425018284 is an apocalyptic number.

It is an amenable number.

21425018284 is a deficient number, since it is larger than the sum of its proper divisors (16845275316).

21425018284 is a wasteful number, since it uses less digits than its factorization.

21425018284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890 (or 2835 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 37.

The spelling of 21425018284 in words is "twenty-one billion, four hundred twenty-five million, eighteen thousand, two hundred eighty-four".