1221010101029 has 2 divisors, whose sum is σ = 1221010101030. Its totient is φ = 1221010101028.

The previous prime is 1221010100987. The next prime is 1221010101061. The reversal of 1221010101029 is 9201010101221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1141414456900 + 79595644129 = 1068370^2 + 282127^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221010101029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221010101029.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221010101229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610505050514 + 610505050515.

It is an arithmetic number, because the mean of its divisors is an integer number (610505050515).

Almost surely, 2^{1221010101029} is an apocalyptic number.

It is an amenable number.

1221010101029 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221010101029 is an equidigital number, since it uses as much as digits as its factorization.

1221010101029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 1221010101029 in words is "one trillion, two hundred twenty-one billion, ten million, one hundred one thousand, twenty-nine".