1220021225251 has 2 divisors, whose sum is σ = 1220021225252. Its totient is φ = 1220021225250.

The previous prime is 1220021225221. The next prime is 1220021225309. The reversal of 1220021225251 is 1525221200221.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220021225251 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220021225201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610010612625 + 610010612626.

It is an arithmetic number, because the mean of its divisors is an integer number (610010612626).

Almost surely, 2^{1220021225251} is an apocalyptic number.

1220021225251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220021225251 is an equidigital number, since it uses as much as digits as its factorization.

1220021225251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 1220021225251 its reverse (1525221200221), we get a palindrome (2745242425472).

The spelling of 1220021225251 in words is "one trillion, two hundred twenty billion, twenty-one million, two hundred twenty-five thousand, two hundred fifty-one".