121504485253853 has 4 divisors (see below), whose sum is σ = 130850984119548. Its totient is φ = 112157986388160.

The previous prime is 121504485253849. The next prime is 121504485253859. The reversal of 121504485253853 is 358352584405121.

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 42137001655204 + 79367483598649 = 6491302^2 + 8908843^2 .

It is a cyclic number.

It is not a de Polignac number, because 121504485253853 - 2² = 121504485253849 is a prime.

It is a super-2 number, since 2×121504485253853² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121504485253859) 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, 4673249432828 + ... + 4673249432853.

It is an arithmetic number, because the mean of its divisors is an integer number (32712746029887).

Almost surely, 2^{121504485253853} is an apocalyptic number.

121504485253853 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

121504485253853 is a deficient number, since it is larger than the sum of its proper divisors (9346498865695).

121504485253853 is an equidigital number, since it uses as much as digits as its factorization.

121504485253853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9346498865694.

The product of its (nonzero) digits is 23040000, while the sum is 56.

The spelling of 121504485253853 in words is "one hundred twenty-one trillion, five hundred four billion, four hundred eighty-five million, two hundred fifty-three thousand, eight hundred fifty-three".