215214211240 has 160 divisors (see below), whose sum is σ = 572660752680. Its totient is φ = 72774567936.

The previous prime is 215214211207. The next prime is 215214211259. The reversal of 215214211240 is 42112412512.

It can be written as a sum of positive squares in 4 ways, for example, as 131692055236 + 83522156004 = 362894^2 + 289002^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6995572 + ... + 7026268.

Almost surely, 2^215214211240 is an apocalyptic number.

215214211240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215214211240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286330376340).

215214211240 is an abundant number, since it is smaller than the sum of its proper divisors (357446541440).

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

215214211240 is an equidigital number, since it uses as much as digits as its factorization.

215214211240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30809 (or 30784 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

Adding to 215214211240 its reverse (42112412512), we get a palindrome (257326623752).

The spelling of 215214211240 in words is "two hundred fifteen billion, two hundred fourteen million, two hundred eleven thousand, two hundred forty".