21154655604 has 24 divisors (see below), whose sum is σ = 49363751808. Its totient is φ = 7051139200.

The previous prime is 21154655603. The next prime is 21154655609. The reversal of 21154655604 is 40655645112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154655603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218629 + ... + 300179.

It is an arithmetic number, because the mean of its divisors is an integer number (2056822992).

Almost surely, 2^21154655604 is an apocalyptic number.

It is an amenable number.

21154655604 is an abundant number, since it is smaller than the sum of its proper divisors (28209096204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21154655604 is a wasteful number, since it uses less digits than its factorization.

21154655604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103175 (or 103173 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 21154655604 in words is "twenty-one billion, one hundred fifty-four million, six hundred fifty-five thousand, six hundred four".