1221212011057 has 2 divisors, whose sum is σ = 1221212011058. Its totient is φ = 1221212011056.

The previous prime is 1221212011027. The next prime is 1221212011111. The reversal of 1221212011057 is 7501102121221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1173497724961 + 47714286096 = 1083281^2 + 218436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221212011057 - 2²⁷ = 1221077793329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221212011027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610606005528 + 610606005529.

It is an arithmetic number, because the mean of its divisors is an integer number (610606005529).

Almost surely, 2^{1221212011057} is an apocalyptic number.

It is an amenable number.

1221212011057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221212011057 is an equidigital number, since it uses as much as digits as its factorization.

1221212011057 is an evil number, because the sum of its binary digits is even.

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

Adding to 1221212011057 its reverse (7501102121221), we get a palindrome (8722314132278).

The spelling of 1221212011057 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, eleven thousand, fifty-seven".