21436160464 has 10 divisors (see below), whose sum is σ = 41532560930. Its totient is φ = 10718080224.

The previous prime is 21436160453. The next prime is 21436160483. The reversal of 21436160464 is 46406163412.

It can be written as a sum of positive squares in only one way, i.e., 15873984064 + 5562176400 = 125992^2 + 74580^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669879999 + ... + 669880030.

It is an arithmetic number, because the mean of its divisors is an integer number (4153256093).

Almost surely, 2^21436160464 is an apocalyptic number.

It is an amenable number.

21436160464 is a deficient number, since it is larger than the sum of its proper divisors (20096400466).

21436160464 is a wasteful number, since it uses less digits than its factorization.

21436160464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339760037 (or 1339760031 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 21436160464 in words is "twenty-one billion, four hundred thirty-six million, one hundred sixty thousand, four hundred sixty-four".