1220120202157 has 2 divisors, whose sum is σ = 1220120202158. Its totient is φ = 1220120202156.

The previous prime is 1220120202139. The next prime is 1220120202167. The reversal of 1220120202157 is 7512020210221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1168065954441 + 52054247716 = 1080771^2 + 228154^2 .

It is an emirp because it is prime and its reverse (7512020210221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220120202157 - 2³¹ = 1217972718509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220120202167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610060101078 + 610060101079.

It is an arithmetic number, because the mean of its divisors is an integer number (610060101079).

Almost surely, 2^{1220120202157} is an apocalyptic number.

It is an amenable number.

1220120202157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220120202157 is an equidigital number, since it uses as much as digits as its factorization.

1220120202157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 25.

Adding to 1220120202157 its reverse (7512020210221), we get a palindrome (8732140412378).

The spelling of 1220120202157 in words is "one trillion, two hundred twenty billion, one hundred twenty million, two hundred two thousand, one hundred fifty-seven".