21002664306 has 32 divisors (see below), whose sum is σ = 46198994688. Its totient is φ = 6324860160.

The previous prime is 21002664301. The next prime is 21002664313. The reversal of 21002664306 is 60346620012.

It is a super-2 number, since 2×21002664306² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21002664301) 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, 2860855 + ... + 2868186.

It is an arithmetic number, because the mean of its divisors is an integer number (1443718584).

Almost surely, 2^21002664306 is an apocalyptic number.

21002664306 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21002664306 is an abundant number, since it is smaller than the sum of its proper divisors (25196330382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21002664306 is a wasteful number, since it uses less digits than its factorization.

21002664306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5729106.

The product of its (nonzero) digits is 10368, while the sum is 30.

The spelling of 21002664306 in words is "twenty-one billion, two million, six hundred sixty-four thousand, three hundred six".