21409855484 has 12 divisors (see below), whose sum is σ = 37475088000. Its totient is φ = 10702687488.

The previous prime is 21409855483. The next prime is 21409855487. The reversal of 21409855484 is 48455890412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21409855483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538469 + ... + 576860.

It is an arithmetic number, because the mean of its divisors is an integer number (3122924000).

Almost surely, 2^21409855484 is an apocalyptic number.

It is an amenable number.

21409855484 is a deficient number, since it is larger than the sum of its proper divisors (16065232516).

21409855484 is a wasteful number, since it uses less digits than its factorization.

21409855484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120132 (or 1120130 counting only the distinct ones).

The product of its (nonzero) digits is 1843200, while the sum is 50.

The spelling of 21409855484 in words is "twenty-one billion, four hundred nine million, eight hundred fifty-five thousand, four hundred eighty-four".