1211021000029 has 2 divisors, whose sum is σ = 1211021000030. Its totient is φ = 1211021000028.

The previous prime is 1211020999961. The next prime is 1211021000039. The reversal of 1211021000029 is 9200001201121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 820839624004 + 390181376025 = 906002^2 + 624645^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211021000029 - 2²⁵ = 1210987445597 is a prime.

It is a super-2 number, since 2×1211021000029² (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 (1211021000039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605510500014 + 605510500015.

It is an arithmetic number, because the mean of its divisors is an integer number (605510500015).

Almost surely, 2^{1211021000029} is an apocalyptic number.

It is an amenable number.

1211021000029 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211021000029 is an equidigital number, since it uses as much as digits as its factorization.

1211021000029 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 19.

The spelling of 1211021000029 in words is "one trillion, two hundred eleven billion, twenty-one million, twenty-nine", and thus it is an aban number.