21426156032 has 30 divisors (see below), whose sum is σ = 42817082913. Its totient is φ = 10711421952.

The previous prime is 21426156007. The next prime is 21426156047. The reversal of 21426156032 is 23065162412.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 15451484416 + 5974671616 = 124304^2 + 77296^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=103504.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21426156032.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3308894 + ... + 3315362.

Almost surely, 2^21426156032 is an apocalyptic number.

It is an amenable number.

21426156032 is a deficient number, since it is larger than the sum of its proper divisors (21390926881).

21426156032 is an frugal number, since it uses more digits than its factorization.

21426156032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12956 (or 6471 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

Multiplying 21426156032 by its sum of digits (32), we get a square (685636993024 = 828032²).

21426156032 divided by its sum of digits (32) gives a square (669567376 = 25876²).

The spelling of 21426156032 in words is "twenty-one billion, four hundred twenty-six million, one hundred fifty-six thousand, thirty-two".