1121421251 has 2 divisors, whose sum is σ = 1121421252. Its totient is φ = 1121421250.

The previous prime is 1121421181. The next prime is 1121421283. The reversal of 1121421251 is 1521241211.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1121421251 - 2¹⁸ = 1121159107 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121421451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560710625 + 560710626.

It is an arithmetic number, because the mean of its divisors is an integer number (560710626).

Almost surely, 2^1121421251 is an apocalyptic number.

1121421251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121421251 is an equidigital number, since it uses as much as digits as its factorization.

1121421251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 160, while the sum is 20.

The square root of 1121421251 is about 33487.6283274883. The cubic root of 1121421251 is about 1038.9379107289.

Adding to 1121421251 its reverse (1521241211), we get a palindrome (2642662462).

The spelling of 1121421251 in words is "one billion, one hundred twenty-one million, four hundred twenty-one thousand, two hundred fifty-one".