1251621022 has 32 divisors (see below), whose sum is σ = 2040655680. Its totient is φ = 573419520.

The previous prime is 1251621017. The next prime is 1251621043. The reversal of 1251621022 is 2201261521.

It is a junction number, because it is equal to n+sod(n) for n = 1251620984 and 1251621002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1280598 + ... + 1281574.

It is an arithmetic number, because the mean of its divisors is an integer number (63770490).

Almost surely, 2^1251621022 is an apocalyptic number.

1251621022 is a deficient number, since it is larger than the sum of its proper divisors (789034658).

1251621022 is a wasteful number, since it uses less digits than its factorization.

1251621022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1251621022 is about 35378.2563448229. The cubic root of 1251621022 is about 1077.6827953432.

Adding to 1251621022 its reverse (2201261521), we get a palindrome (3452882543).

The spelling of 1251621022 in words is "one billion, two hundred fifty-one million, six hundred twenty-one thousand, twenty-two".