21064513377 has 32 divisors (see below), whose sum is σ = 28945382400. Its totient is φ = 13621576640.

The previous prime is 21064513363. The next prime is 21064513403. The reversal of 21064513377 is 77331546012.

It is a cyclic number.

It is not a de Polignac number, because 21064513377 - 2⁶ = 21064513313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21064515377) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3392758 + ... + 3398960.

It is an arithmetic number, because the mean of its divisors is an integer number (904543200).

Almost surely, 2^21064513377 is an apocalyptic number.

It is an amenable number.

21064513377 is a deficient number, since it is larger than the sum of its proper divisors (7880869023).

21064513377 is a wasteful number, since it uses less digits than its factorization.

21064513377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6533.

The product of its (nonzero) digits is 105840, while the sum is 39.

The spelling of 21064513377 in words is "twenty-one billion, sixty-four million, five hundred thirteen thousand, three hundred seventy-seven".