215245046421 has 12 divisors (see below), whose sum is σ = 318492670860. Its totient is φ = 139996777920.

The previous prime is 215245046353. The next prime is 215245046437. The reversal of 215245046421 is 124640542512.

215245046421 is a `hidden beast` number, since 2 + 1 + 5 + 2 + 4 + 5 + 0 + 4 + 642 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8298299025 + 206946747396 = 91095^2 + 454914^2 .

It is not a de Polignac number, because 215245046421 - 2¹⁰ = 215245045397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215245046461) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 291659586 + ... + 291660323.

It is an arithmetic number, because the mean of its divisors is an integer number (26541055905).

Almost surely, 2^215245046421 is an apocalyptic number.

It is an amenable number.

215245046421 is a deficient number, since it is larger than the sum of its proper divisors (103247624439).

215245046421 is a wasteful number, since it uses less digits than its factorization.

215245046421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583319956 (or 583319953 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

Adding to 215245046421 its reverse (124640542512), we get a palindrome (339885588933).

The spelling of 215245046421 in words is "two hundred fifteen billion, two hundred forty-five million, forty-six thousand, four hundred twenty-one".