215274421 has 8 divisors (see below), whose sum is σ = 219713760. Its totient is φ = 210861552.

The previous prime is 215274407. The next prime is 215274439. The reversal of 215274421 is 124472512.

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 215274421 - 2¹³ = 215266229 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 215274421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215274401) 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, 10251 + ... + 23143.

It is an arithmetic number, because the mean of its divisors is an integer number (27464220).

Almost surely, 2^215274421 is an apocalyptic number.

It is an amenable number.

215274421 is a deficient number, since it is larger than the sum of its proper divisors (4439339).

215274421 is a wasteful number, since it uses less digits than its factorization.

215274421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13235.

The product of its digits is 4480, while the sum is 28.

The square root of 215274421 is about 14672.2329929701. The cubic root of 215274421 is about 599.3274139209.

The spelling of 215274421 in words is "two hundred fifteen million, two hundred seventy-four thousand, four hundred twenty-one".