1052121051221 has 4 divisors (see below), whose sum is σ = 1088401087500. Its totient is φ = 1015841014944.

The previous prime is 1052121051203. The next prime is 1052121051283. The reversal of 1052121051221 is 1221501212501.

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 367613028721 + 684508022500 = 606311^2 + 827350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1052121051221 is a prime.

It is a super-2 number, since 2×1052121051221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1052121051521) 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, 18140018096 + ... + 18140018153.

It is an arithmetic number, because the mean of its divisors is an integer number (272100271875).

Almost surely, 2^{1052121051221} is an apocalyptic number.

It is an amenable number.

1052121051221 is a deficient number, since it is larger than the sum of its proper divisors (36280036279).

1052121051221 is an equidigital number, since it uses as much as digits as its factorization.

1052121051221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36280036278.

The product of its (nonzero) digits is 400, while the sum is 23.

Adding to 1052121051221 its reverse (1221501212501), we get a palindrome (2273622263722).

The spelling of 1052121051221 in words is "one trillion, fifty-two billion, one hundred twenty-one million, fifty-one thousand, two hundred twenty-one".