1210021200121 has 4 divisors (see below), whose sum is σ = 1216290740212. Its totient is φ = 1203751660032.

The previous prime is 1210021200107. The next prime is 1210021200127.

1210021200121 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 508889623225 + 701131576896 = 713365^2 + 837336^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210021200121 - 2³⁵ = 1175661461753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210021200127) 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, 3134769756 + ... + 3134770141.

It is an arithmetic number, because the mean of its divisors is an integer number (304072685053).

Almost surely, 2^{1210021200121} is an apocalyptic number.

It is an amenable number.

1210021200121 is a deficient number, since it is larger than the sum of its proper divisors (6269540091).

1210021200121 is an equidigital number, since it uses as much as digits as its factorization.

1210021200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6269540090.

The product of its (nonzero) digits is 16, while the sum is 13.

The spelling of 1210021200121 in words is "one trillion, two hundred ten billion, twenty-one million, two hundred thousand, one hundred twenty-one".