30211121221997 has 2 divisors, whose sum is σ = 30211121221998. Its totient is φ = 30211121221996.

The previous prime is 30211121221969. The next prime is 30211121222041. The reversal of 30211121221997 is 79912212111203.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16698248149801 + 13512873072196 = 4086349^2 + 3675986^2 .

It is a cyclic number.

It is not a de Polignac number, because 30211121221997 - 2²⁶ = 30211054113133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30211121221907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15105560610998 + 15105560610999.

It is an arithmetic number, because the mean of its divisors is an integer number (15105560610999).

Almost surely, 2^{30211121221997} is an apocalyptic number.

It is an amenable number.

30211121221997 is a deficient number, since it is larger than the sum of its proper divisors (1).

30211121221997 is an equidigital number, since it uses as much as digits as its factorization.

30211121221997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 41.

The spelling of 30211121221997 in words is "thirty trillion, two hundred eleven billion, one hundred twenty-one million, two hundred twenty-one thousand, nine hundred ninety-seven".