215602401 has 24 divisors (see below), whose sum is σ = 335070624. Its totient is φ = 122955840.

The previous prime is 215602393. The next prime is 215602447. The reversal of 215602401 is 104206512.

It is not a de Polignac number, because 215602401 - 2³ = 215602393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (215602001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93381 + ... + 95661.

It is an arithmetic number, because the mean of its divisors is an integer number (13961276).

Almost surely, 2^215602401 is an apocalyptic number.

215602401 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

215602401 is a deficient number, since it is larger than the sum of its proper divisors (119468223).

215602401 is a wasteful number, since it uses less digits than its factorization.

215602401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2941 (or 2934 counting only the distinct ones).

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

The square root of 215602401 is about 14683.4056335715. The cubic root of 215602401 is about 599.6316266592.

Adding to 215602401 its reverse (104206512), we get a palindrome (319808913).

The spelling of 215602401 in words is "two hundred fifteen million, six hundred two thousand, four hundred one".