64215121 has 4 divisors (see below), whose sum is σ = 64364544. Its totient is φ = 64065700.

The previous prime is 64215101. The next prime is 64215133. The reversal of 64215121 is 12151246.

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 64215121 - 2¹³ = 64206929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64215092 and 64215101.

It is not an unprimeable number, because it can be changed into a prime (64215101) 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, 74065 + ... + 74926.

It is an arithmetic number, because the mean of its divisors is an integer number (16091136).

Almost surely, 2^64215121 is an apocalyptic number.

It is an amenable number.

64215121 is a deficient number, since it is larger than the sum of its proper divisors (149423).

64215121 is a wasteful number, since it uses less digits than its factorization.

64215121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149422.

The product of its digits is 480, while the sum is 22.

The square root of 64215121 is about 8013.4337833416. The cubic root of 64215121 is about 400.4476675475.

Adding to 64215121 its reverse (12151246), we get a palindrome (76366367).

The spelling of 64215121 in words is "sixty-four million, two hundred fifteen thousand, one hundred twenty-one".