21345765002 has 16 divisors (see below), whose sum is σ = 32068761192. Its totient is φ = 10656192960.

The previous prime is 21345764971. The next prime is 21345765041. The reversal of 21345765002 is 20056754312.

It can be written as a sum of positive squares in 4 ways, for example, as 8841828961 + 12503936041 = 94031^2 + 111821^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5317148 + ... + 5321160.

Almost surely, 2^21345765002 is an apocalyptic number.

21345765002 is a deficient number, since it is larger than the sum of its proper divisors (10722996190).

21345765002 is a wasteful number, since it uses less digits than its factorization.

21345765002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7513.

The product of its (nonzero) digits is 50400, while the sum is 35.

The spelling of 21345765002 in words is "twenty-one billion, three hundred forty-five million, seven hundred sixty-five thousand, two".