64215413021 has 4 divisors (see below), whose sum is σ = 64317181344. Its totient is φ = 64113644700.

The previous prime is 64215412997. The next prime is 64215413099. The reversal of 64215413021 is 12031451246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64215413021 - 2⁶ = 64215412957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64212413021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50883215 + ... + 50884476.

It is an arithmetic number, because the mean of its divisors is an integer number (16079295336).

Almost surely, 2^64215413021 is an apocalyptic number.

It is an amenable number.

64215413021 is a deficient number, since it is larger than the sum of its proper divisors (101768323).

64215413021 is a wasteful number, since it uses less digits than its factorization.

64215413021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101768322.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 64215413021 its reverse (12031451246), we get a palindrome (76246864267).

The spelling of 64215413021 in words is "sixty-four billion, two hundred fifteen million, four hundred thirteen thousand, twenty-one".