1220120292221 has 2 divisors, whose sum is σ = 1220120292222. Its totient is φ = 1220120292220.

The previous prime is 1220120292173. The next prime is 1220120292229. The reversal of 1220120292221 is 1222920210221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 886168063225 + 333952228996 = 941365^2 + 577886^2 .

It is an emirp because it is prime and its reverse (1222920210221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220120292221 is a prime.

It is a super-2 number, since 2×1220120292221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220120292229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610060146110 + 610060146111.

It is an arithmetic number, because the mean of its divisors is an integer number (610060146111).

Almost surely, 2^{1220120292221} is an apocalyptic number.

It is an amenable number.

1220120292221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220120292221 is an equidigital number, since it uses as much as digits as its factorization.

1220120292221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 1220120292221 in words is "one trillion, two hundred twenty billion, one hundred twenty million, two hundred ninety-two thousand, two hundred twenty-one".