21026160016 has 15 divisors (see below), whose sum is σ = 40739308843. Its totient is φ = 10512790000.

The previous prime is 21026159993. The next prime is 21026160017. The reversal of 21026160016 is 61006162012.

The square root of 21026160016 is 145004.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21026160017) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 561891 + ... + 598141.

Almost surely, 2^21026160016 is an apocalyptic number.

21026160016 is the 145004-th square number.

It is an amenable number.

21026160016 is a deficient number, since it is larger than the sum of its proper divisors (19713148827).

21026160016 is an frugal number, since it uses more digits than its factorization.

21026160016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72510 (or 36253 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

Multiplying 21026160016 by its sum of digits (25), we get a square (525654000400 = 725020²).

The spelling of 21026160016 in words is "twenty-one billion, twenty-six million, one hundred sixty thousand, sixteen".