1201220003021 has 2 divisors, whose sum is σ = 1201220003022. Its totient is φ = 1201220003020.

The previous prime is 1201220002981. The next prime is 1201220003023. The reversal of 1201220003021 is 1203000221021.

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., 1119945975625 + 81274027396 = 1058275^2 + 285086^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201220003021 - 2²² = 1201215808717 is a prime.

Together with 1201220003023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201220002987 and 1201220003005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201220003023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600610001510 + 600610001511.

It is an arithmetic number, because the mean of its divisors is an integer number (600610001511).

Almost surely, 2^{1201220003021} is an apocalyptic number.

It is an amenable number.

1201220003021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201220003021 is an equidigital number, since it uses as much as digits as its factorization.

1201220003021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 1201220003021 its reverse (1203000221021), we get a palindrome (2404220224042).

The spelling of 1201220003021 in words is "one trillion, two hundred one billion, two hundred twenty million, three thousand, twenty-one".