2121572 has 6 divisors (see below), whose sum is σ = 3712758. Its totient is φ = 1060784.

The previous prime is 2121569. The next prime is 2121601. The reversal of 2121572 is 2751212.

It can be written as a sum of positive squares in only one way, i.e., 1915456 + 206116 = 1384^2 + 454^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265193 + ... + 265200.

It is an arithmetic number, because the mean of its divisors is an integer number (618793).

2^2121572 is an apocalyptic number.

It is an amenable number.

2121572 is a deficient number, since it is larger than the sum of its proper divisors (1591186).

2121572 is a wasteful number, since it uses less digits than its factorization.

2121572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530397 (or 530395 counting only the distinct ones).

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

The square root of 2121572 is about 1456.5617048378. The cubic root of 2121572 is about 128.4949101427.

Adding to 2121572 its reverse (2751212), we get a palindrome (4872784).

The spelling of 2121572 in words is "two million, one hundred twenty-one thousand, five hundred seventy-two".