1220221100951 has 2 divisors, whose sum is σ = 1220221100952. Its totient is φ = 1220221100950.

The previous prime is 1220221100927. The next prime is 1220221101019. The reversal of 1220221100951 is 1590011220221.

It is a weak prime.

It is an emirp because it is prime and its reverse (1590011220221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220221100951 - 2¹⁰ = 1220221099927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220221100951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220221100251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610110550475 + 610110550476.

It is an arithmetic number, because the mean of its divisors is an integer number (610110550476).

Almost surely, 2^{1220221100951} is an apocalyptic number.

1220221100951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220221100951 is an equidigital number, since it uses as much as digits as its factorization.

1220221100951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 26.

The spelling of 1220221100951 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one hundred thousand, nine hundred fifty-one".