215205011004 has 24 divisors (see below), whose sum is σ = 502293289680. Its totient is φ = 71713823104.

The previous prime is 215205010907. The next prime is 215205011023. The reversal of 215205011004 is 400110502512.

It is a super-2 number, since 2×215205011004² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2605209 + ... + 2686544.

It is an arithmetic number, because the mean of its divisors is an integer number (20928887070).

Almost surely, 2^215205011004 is an apocalyptic number.

It is an amenable number.

215205011004 is an abundant number, since it is smaller than the sum of its proper divisors (287088278676).

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

215205011004 is a wasteful number, since it uses less digits than its factorization.

215205011004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5295149 (or 5295147 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 215205011004 its reverse (400110502512), we get a palindrome (615315513516).

The spelling of 215205011004 in words is "two hundred fifteen billion, two hundred five million, eleven thousand, four".