21026740036 has 9 divisors (see below), whose sum is σ = 36797302591. Its totient is φ = 10513225012.

The previous prime is 21026739991. The next prime is 21026740057. The reversal of 21026740036 is 63004762012.

The square root of 21026740036 is 145006.

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

It is a Duffinian number.

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, 253761 + ... + 326263.

Almost surely, 2^21026740036 is an apocalyptic number.

21026740036 is the 145006-th square number.

It is an amenable number.

21026740036 is a deficient number, since it is larger than the sum of its proper divisors (15770562555).

21026740036 is an frugal number, since it uses more digits than its factorization.

21026740036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145010 (or 72505 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 31.

The spelling of 21026740036 in words is "twenty-one billion, twenty-six million, seven hundred forty thousand, thirty-six".