1201210121021 has 4 divisors (see below), whose sum is σ = 1201501045500. Its totient is φ = 1200919196544.

The previous prime is 1201210120997. The next prime is 1201210121063.

1201210121021 is nontrivially palindromic in base 10.

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 669141996121 + 532068124900 = 818011^2 + 729430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201210121021 - 2²² = 1201205926717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201210120987 and 1201210121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201210127021) 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, 145456046 + ... + 145464303.

It is an arithmetic number, because the mean of its divisors is an integer number (300375261375).

Almost surely, 2^{1201210121021} is an apocalyptic number.

It is an amenable number.

1201210121021 is a deficient number, since it is larger than the sum of its proper divisors (290924479).

1201210121021 is an equidigital number, since it uses as much as digits as its factorization.

1201210121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290924478.

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

It can be divided in two parts, 1201210 and 121021, that added together give a palindrome (1322231).

The spelling of 1201210121021 in words is "one trillion, two hundred one billion, two hundred ten million, one hundred twenty-one thousand, twenty-one".