1251222621 has 8 divisors (see below), whose sum is σ = 1819960224. Its totient is φ = 758316720.

The previous prime is 1251222607. The next prime is 1251222653. The reversal of 1251222621 is 1262221521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1251222621 - 2⁷ = 1251222493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1251222591 and 1251222600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255222621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18957886 + ... + 18957951.

It is an arithmetic number, because the mean of its divisors is an integer number (227495028).

Almost surely, 2^1251222621 is an apocalyptic number.

1251222621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1251222621 is a deficient number, since it is larger than the sum of its proper divisors (568737603).

1251222621 is a wasteful number, since it uses less digits than its factorization.

1251222621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37915851.

The product of its digits is 960, while the sum is 24.

The square root of 1251222621 is about 35372.6253054534. The cubic root of 1251222621 is about 1077.5684381858.

The spelling of 1251222621 in words is "one billion, two hundred fifty-one million, two hundred twenty-two thousand, six hundred twenty-one".