1212202121021 has 2 divisors, whose sum is σ = 1212202121022. Its totient is φ = 1212202121020.

The previous prime is 1212202121017. The next prime is 1212202121033. The reversal of 1212202121021 is 1201212022121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 607369276921 + 604832844100 = 779339^2 + 777710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212202121021 - 2² = 1212202121017 is a prime.

It is a super-2 number, since 2×1212202121021² (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 (1212202120021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606101060510 + 606101060511.

It is an arithmetic number, because the mean of its divisors is an integer number (606101060511).

Almost surely, 2^{1212202121021} is an apocalyptic number.

It is an amenable number.

1212202121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212202121021 is an equidigital number, since it uses as much as digits as its factorization.

1212202121021 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 1212202121021 its reverse (1201212022121), we get a palindrome (2413414143142).

The spelling of 1212202121021 in words is "one trillion, two hundred twelve billion, two hundred two million, one hundred twenty-one thousand, twenty-one".