215642001 has 32 divisors (see below), whose sum is σ = 316068480. Its totient is φ = 130291200.

The previous prime is 215641939. The next prime is 215642027. The reversal of 215642001 is 100246512.

It is not a de Polignac number, because 215642001 - 2¹¹ = 215639953 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215642101) 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, 122991 + ... + 124731.

It is an arithmetic number, because the mean of its divisors is an integer number (9877140).

Almost surely, 2^215642001 is an apocalyptic number.

It is an amenable number.

215642001 is a deficient number, since it is larger than the sum of its proper divisors (100426479).

215642001 is a wasteful number, since it uses less digits than its factorization.

215642001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 215642001 is about 14684.7540326694. The cubic root of 215642001 is about 599.6683361434.

Adding to 215642001 its reverse (100246512), we get a palindrome (315888513).

The spelling of 215642001 in words is "two hundred fifteen million, six hundred forty-two thousand, one".