21545464726 has 32 divisors (see below), whose sum is σ = 34610859360. Its totient is φ = 10023436800.

The previous prime is 21545464693. The next prime is 21545464727. The reversal of 21545464726 is 62746454512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21545464727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1702161 + ... + 1714771.

It is an arithmetic number, because the mean of its divisors is an integer number (1081589355).

Almost surely, 2^21545464726 is an apocalyptic number.

21545464726 is a deficient number, since it is larger than the sum of its proper divisors (13065394634).

21545464726 is a wasteful number, since it uses less digits than its factorization.

21545464726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13200.

The product of its digits is 1612800, while the sum is 46.

The spelling of 21545464726 in words is "twenty-one billion, five hundred forty-five million, four hundred sixty-four thousand, seven hundred twenty-six".