215021056254121 has 24 divisors (see below), whose sum is σ = 246215476372824. Its totient is φ = 186629554452480.

The previous prime is 215021056254089. The next prime is 215021056254131. The reversal of 215021056254121 is 121452650120512.

It can be written as a sum of positive squares in 12 ways, for example, as 19364114025 + 215001692140096 = 139155^2 + 14662936^2 .

It is not a de Polignac number, because 215021056254121 - 2⁵ = 215021056254089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215021056254131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22984660 + ... + 30957013.

It is an arithmetic number, because the mean of its divisors is an integer number (10258978182201).

Almost surely, 2^{215021056254121} is an apocalyptic number.

It is an amenable number.

215021056254121 is a deficient number, since it is larger than the sum of its proper divisors (31194420118703).

215021056254121 is a wasteful number, since it uses less digits than its factorization.

215021056254121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53942781 (or 53942764 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 37.

The spelling of 215021056254121 in words is "two hundred fifteen trillion, twenty-one billion, fifty-six million, two hundred fifty-four thousand, one hundred twenty-one".