1212021211001 has 4 divisors (see below), whose sum is σ = 1283316576372. Its totient is φ = 1140725845632.

The previous prime is 1212021210877. The next prime is 1212021211021. The reversal of 1212021211001 is 1001121202121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1013140889401 + 198880321600 = 1006549^2 + 445960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212021211001 - 2³⁰ = 1210947469177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212021211021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35647682660 + ... + 35647682693.

It is an arithmetic number, because the mean of its divisors is an integer number (320829144093).

Almost surely, 2^{1212021211001} is an apocalyptic number.

It is an amenable number.

1212021211001 is a deficient number, since it is larger than the sum of its proper divisors (71295365371).

1212021211001 is an equidigital number, since it uses as much as digits as its factorization.

1212021211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71295365370.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1212021211001 its reverse (1001121202121), we get a palindrome (2213142413122).

It can be divided in two parts, 121202121 and 1001, that multiplied together give a palindrome (121323323121).

The spelling of 1212021211001 in words is "one trillion, two hundred twelve billion, twenty-one million, two hundred eleven thousand, one".