2215132521660 has 144 divisors (see below), whose sum is σ = 6747654225312. Its totient is φ = 588207398400.

The previous prime is 2215132521571. The next prime is 2215132521683. The reversal of 2215132521660 is 661252315122.

2215132521660 is a `hidden beast` number, since 2 + 21 + 51 + 3 + 2 + 521 + 6 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58611970 + ... + 58649750.

It is an arithmetic number, because the mean of its divisors is an integer number (46858709898).

Almost surely, 2^{2215132521660} is an apocalyptic number.

2215132521660 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 2215132521660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3373827112656).

2215132521660 is an abundant number, since it is smaller than the sum of its proper divisors (4532521703652).

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

2215132521660 is a wasteful number, since it uses less digits than its factorization.

2215132521660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39164 (or 39159 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

Adding to 2215132521660 its reverse (661252315122), we get a palindrome (2876384836782).

The spelling of 2215132521660 in words is "two trillion, two hundred fifteen billion, one hundred thirty-two million, five hundred twenty-one thousand, six hundred sixty".