2157122 has 16 divisors (see below), whose sum is σ = 3582144. Its totient is φ = 966000.

The previous prime is 2157121. The next prime is 2157131. The reversal of 2157122 is 2217512.

It is a junction number, because it is equal to n+sod(n) for n = 2157094 and 2157103.

It is not an unprimeable number, because it can be changed into a prime (2157121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 872 + ... + 2252.

It is an arithmetic number, because the mean of its divisors is an integer number (223884).

2^2157122 is an apocalyptic number.

2157122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2157122 is a deficient number, since it is larger than the sum of its proper divisors (1425022).

2157122 is a wasteful number, since it uses less digits than its factorization.

2157122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465.

The product of its digits is 280, while the sum is 20.

The square root of 2157122 is about 1468.7144038240. The cubic root of 2157122 is about 129.2086441896.

It can be divided in two parts, 215 and 7122, that added together give a palindrome (7337).

The spelling of 2157122 in words is "two million, one hundred fifty-seven thousand, one hundred twenty-two".