215421124 has 12 divisors (see below), whose sum is σ = 377653500. Its totient is φ = 107520128.

The previous prime is 215421121. The next prime is 215421133. The reversal of 215421124 is 421124512.

It can be written as a sum of positive squares in 2 ways, for example, as 138297600 + 77123524 = 11760^2 + 8782^2 .

It is a junction number, because it is equal to n+sod(n) for n = 215421095 and 215421104.

It is not an unprimeable number, because it can be changed into a prime (215421121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45049 + ... + 49600.

It is an arithmetic number, because the mean of its divisors is an integer number (31471125).

Almost surely, 2^215421124 is an apocalyptic number.

It is an amenable number.

215421124 is a deficient number, since it is larger than the sum of its proper divisors (162232376).

215421124 is a wasteful number, since it uses less digits than its factorization.

215421124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95222 (or 95220 counting only the distinct ones).

The product of its digits is 640, while the sum is 22.

The square root of 215421124 is about 14677.2314828104. The cubic root of 215421124 is about 599.4635241695.

Adding to 215421124 its reverse (421124512), we get a palindrome (636545636).

The spelling of 215421124 in words is "two hundred fifteen million, four hundred twenty-one thousand, one hundred twenty-four".