2181522 has 16 divisors (see below), whose sum is σ = 4986432. Its totient is φ = 623280.

The previous prime is 2181503. The next prime is 2181539. The reversal of 2181522 is 2251812.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam 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, 25929 + ... + 26012.

It is an arithmetic number, because the mean of its divisors is an integer number (311652).

2^2181522 is an apocalyptic number.

2181522 is an abundant number, since it is smaller than the sum of its proper divisors (2804910).

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

2181522 is a wasteful number, since it uses less digits than its factorization.

2181522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51953.

The product of its digits is 320, while the sum is 21.

The square root of 2181522 is about 1476.9976303299. The cubic root of 2181522 is about 129.6939942652.

The spelling of 2181522 in words is "two million, one hundred eighty-one thousand, five hundred twenty-two".