2181251074 has 4 divisors (see below), whose sum is σ = 3271876614. Its totient is φ = 1090625536.

The previous prime is 2181251057. The next prime is 2181251089. The reversal of 2181251074 is 4701521812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1837408225 + 343842849 = 42865^2 + 18543^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545312767 + ... + 545312770.

Almost surely, 2^2181251074 is an apocalyptic number.

2181251074 is a deficient number, since it is larger than the sum of its proper divisors (1090625540).

2181251074 is a wasteful number, since it uses less digits than its factorization.

2181251074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090625539.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 2181251074 is about 46703.8657286525. The cubic root of 2181251074 is about 1296.8862508872.

Adding to 2181251074 its reverse (4701521812), we get a palindrome (6882772886).

The spelling of 2181251074 in words is "two billion, one hundred eighty-one million, two hundred fifty-one thousand, seventy-four".