64402342221 has 32 divisors (see below), whose sum is σ = 103399321600. Its totient is φ = 34831581120.

The previous prime is 64402342189. The next prime is 64402342229. The reversal of 64402342221 is 12224320446.

It is not a de Polignac number, because 64402342221 - 2⁵ = 64402342189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64402342229) 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, 351036 + ... + 502026.

It is an arithmetic number, because the mean of its divisors is an integer number (3231228800).

Almost surely, 2^64402342221 is an apocalyptic number.

It is an amenable number.

64402342221 is a deficient number, since it is larger than the sum of its proper divisors (38996979379).

64402342221 is a wasteful number, since it uses less digits than its factorization.

64402342221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152089.

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 64402342221 its reverse (12224320446), we get a palindrome (76626662667).

The spelling of 64402342221 in words is "sixty-four billion, four hundred two million, three hundred forty-two thousand, two hundred twenty-one".