1220211012157 has 2 divisors, whose sum is σ = 1220211012158. Its totient is φ = 1220211012156.

The previous prime is 1220211012107. The next prime is 1220211012191. The reversal of 1220211012157 is 7512101120221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1193892763716 + 26318248441 = 1092654^2 + 162229^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220211012157 - 2³⁹ = 670455198269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220211012107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610105506078 + 610105506079.

It is an arithmetic number, because the mean of its divisors is an integer number (610105506079).

Almost surely, 2^{1220211012157} is an apocalyptic number.

It is an amenable number.

1220211012157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220211012157 is an equidigital number, since it uses as much as digits as its factorization.

1220211012157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 25.

Adding to 1220211012157 its reverse (7512101120221), we get a palindrome (8732312132378).

The spelling of 1220211012157 in words is "one trillion, two hundred twenty billion, two hundred eleven million, twelve thousand, one hundred fifty-seven".