215121396408 has 16 divisors (see below), whose sum is σ = 537803491080. Its totient is φ = 71707132128.

The previous prime is 215121396331. The next prime is 215121396431. The reversal of 215121396408 is 804693121512.

It is a self number, because there is not a number n which added to its sum of digits gives 215121396408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4481695735 + ... + 4481695782.

Almost surely, 2^215121396408 is an apocalyptic number.

It is an amenable number.

215121396408 is an abundant number, since it is smaller than the sum of its proper divisors (322682094672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215121396408 is a wasteful number, since it uses less digits than its factorization.

215121396408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8963391526 (or 8963391522 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 215121396408 in words is "two hundred fifteen billion, one hundred twenty-one million, three hundred ninety-six thousand, four hundred eight".