1221002121041 has 2 divisors, whose sum is σ = 1221002121042. Its totient is φ = 1221002121040.

The previous prime is 1221002120981. The next prime is 1221002121071. The reversal of 1221002121041 is 1401212001221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1217665903441 + 3336217600 = 1103479^2 + 57760^2 .

It is an emirp because it is prime and its reverse (1401212001221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221002121041 - 2²² = 1220997926737 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221002121071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610501060520 + 610501060521.

It is an arithmetic number, because the mean of its divisors is an integer number (610501060521).

Almost surely, 2^{1221002121041} is an apocalyptic number.

It is an amenable number.

1221002121041 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221002121041 is an equidigital number, since it uses as much as digits as its factorization.

1221002121041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221002121041 its reverse (1401212001221), we get a palindrome (2622214122262).

The spelling of 1221002121041 in words is "one trillion, two hundred twenty-one billion, two million, one hundred twenty-one thousand, forty-one".