215755001220 has 192 divisors, whose sum is σ = 734527180800. Its totient is φ = 46636554240.

The previous prime is 215755001191. The next prime is 215755001279. The reversal of 215755001220 is 22100557512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 292860 + ... + 719219.

It is an arithmetic number, because the mean of its divisors is an integer number (3825662400).

Almost surely, 2^215755001220 is an apocalyptic number.

215755001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215755001220 is an abundant number, since it is smaller than the sum of its proper divisors (518772179580).

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

215755001220 is a wasteful number, since it uses less digits than its factorization.

215755001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012138 (or 1012136 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 30.

Adding to 215755001220 its reverse (22100557512), we get a palindrome (237855558732).

The spelling of 215755001220 in words is "two hundred fifteen billion, seven hundred fifty-five million, one thousand, two hundred twenty".