21436465554 has 48 divisors (see below), whose sum is σ = 56203175808. Its totient is φ = 5764427136.

The previous prime is 21436465481. The next prime is 21436465577. The reversal of 21436465554 is 45556463412.

21436465554 is a `hidden beast` number, since 2 + 1 + 4 + 36 + 4 + 65 + 554 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5001702 + ... + 5005985.

It is an arithmetic number, because the mean of its divisors is an integer number (1170899496).

Almost surely, 2^21436465554 is an apocalyptic number.

21436465554 is an abundant number, since it is smaller than the sum of its proper divisors (34766710254).

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

21436465554 is a wasteful number, since it uses less digits than its factorization.

21436465554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10007719 (or 10007716 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 45.

The spelling of 21436465554 in words is "twenty-one billion, four hundred thirty-six million, four hundred sixty-five thousand, five hundred fifty-four".