121565263373 has 4 divisors (see below), whose sum is σ = 122038280220. Its totient is φ = 121092246528.

The previous prime is 121565263349. The next prime is 121565263409. The reversal of 121565263373 is 373362565121.

It is a happy number.

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 112582394089 + 8982869284 = 335533^2 + 94778^2 .

It is a cyclic number.

It is not a de Polignac number, because 121565263373 - 2¹⁰ = 121565262349 is a prime.

It is a super-2 number, since 2×121565263373² (a number of 23 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 (121565233373) 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, 236508038 + ... + 236508551.

It is an arithmetic number, because the mean of its divisors is an integer number (30509570055).

Almost surely, 2^121565263373 is an apocalyptic number.

It is an amenable number.

121565263373 is a deficient number, since it is larger than the sum of its proper divisors (473016847).

121565263373 is an equidigital number, since it uses as much as digits as its factorization.

121565263373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473016846.

The product of its digits is 680400, while the sum is 44.

The spelling of 121565263373 in words is "one hundred twenty-one billion, five hundred sixty-five million, two hundred sixty-three thousand, three hundred seventy-three".