64021641 has 4 divisors (see below), whose sum is σ = 85362192. Its totient is φ = 42681092.

The previous prime is 64021613. The next prime is 64021669. The reversal of 64021641 is 14612046.

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 an interprime number because it is at equal distance from previous prime (64021613) and next prime (64021669).

It is a cyclic number.

It is not a de Polignac number, because 64021641 - 2⁹ = 64021129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64021681) 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, 10670271 + ... + 10670276.

It is an arithmetic number, because the mean of its divisors is an integer number (21340548).

Almost surely, 2^64021641 is an apocalyptic number.

It is an amenable number.

64021641 is a deficient number, since it is larger than the sum of its proper divisors (21340551).

64021641 is a wasteful number, since it uses less digits than its factorization.

64021641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21340550.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 64021641 is about 8001.3524481802. The cubic root of 64021641 is about 400.0450803359.

Adding to 64021641 its reverse (14612046), we get a palindrome (78633687).

The spelling of 64021641 in words is "sixty-four million, twenty-one thousand, six hundred forty-one".