215152021 has 8 divisors (see below), whose sum is σ = 246666240. Its totient is φ = 183832368.

The previous prime is 215151973. The next prime is 215152031. The reversal of 215152021 is 120251512.

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

It is a cyclic number.

It is not a de Polignac number, because 215152021 - 2⁹ = 215151509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215152021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215152031) 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, 46261 + ... + 50698.

It is an arithmetic number, because the mean of its divisors is an integer number (30833280).

Almost surely, 2^215152021 is an apocalyptic number.

It is an amenable number.

215152021 is a deficient number, since it is larger than the sum of its proper divisors (31514219).

215152021 is an equidigital number, since it uses as much as digits as its factorization.

215152021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97283.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 215152021 is about 14668.0612556670. The cubic root of 215152021 is about 599.2138045370.

The spelling of 215152021 in words is "two hundred fifteen million, one hundred fifty-two thousand, twenty-one".