215651025121 has 24 divisors (see below), whose sum is σ = 261854735040. Its totient is φ = 176747310432.

The previous prime is 215651025053. The next prime is 215651025131. The reversal of 215651025121 is 121520156512.

It is not a de Polignac number, because 215651025121 - 2¹⁵ = 215650992353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215651025131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3473070 + ... + 3534616.

It is an arithmetic number, because the mean of its divisors is an integer number (10910613960).

Almost surely, 2^215651025121 is an apocalyptic number.

It is an amenable number.

215651025121 is a deficient number, since it is larger than the sum of its proper divisors (46203709919).

215651025121 is a wasteful number, since it uses less digits than its factorization.

215651025121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64693 (or 64686 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 31.

The spelling of 215651025121 in words is "two hundred fifteen billion, six hundred fifty-one million, twenty-five thousand, one hundred twenty-one".