1221202951 has 2 divisors, whose sum is σ = 1221202952. Its totient is φ = 1221202950.

The previous prime is 1221202921. The next prime is 1221203059. The reversal of 1221202951 is 1592021221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221202951 - 2⁷ = 1221202823 is a prime.

It is a super-2 number, since 2×1221202951² = 2982673295062216802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221202901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610601475 + 610601476.

It is an arithmetic number, because the mean of its divisors is an integer number (610601476).

Almost surely, 2^1221202951 is an apocalyptic number.

1221202951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221202951 is an equidigital number, since it uses as much as digits as its factorization.

1221202951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1221202951 is about 34945.7143438219. The cubic root of 1221202951 is about 1068.8808139367.

The spelling of 1221202951 in words is "one billion, two hundred twenty-one million, two hundred two thousand, nine hundred fifty-one".