215148921 has 8 divisors (see below), whose sum is σ = 308931840. Its totient is φ = 132399312.

The previous prime is 215148919. The next prime is 215148943. The reversal of 215148921 is 129841512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 215148921 - 2¹ = 215148919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215148961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2758281 + ... + 2758358.

It is an arithmetic number, because the mean of its divisors is an integer number (38616480).

Almost surely, 2^215148921 is an apocalyptic number.

It is an amenable number.

215148921 is a deficient number, since it is larger than the sum of its proper divisors (93782919).

215148921 is a wasteful number, since it uses less digits than its factorization.

215148921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5516655.

The product of its digits is 5760, while the sum is 33.

The square root of 215148921 is about 14667.9555835161. The cubic root of 215148921 is about 599.2109266158.

The spelling of 215148921 in words is "two hundred fifteen million, one hundred forty-eight thousand, nine hundred twenty-one".