1253055400221 has 4 divisors (see below), whose sum is σ = 1670740533632. Its totient is φ = 835370266812.

The previous prime is 1253055400217. The next prime is 1253055400243. The reversal of 1253055400221 is 1220045503521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1253055400221 - 2² = 1253055400217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253055400291) 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, 208842566701 + ... + 208842566706.

It is an arithmetic number, because the mean of its divisors is an integer number (417685133408).

Almost surely, 2^{1253055400221} is an apocalyptic number.

It is an amenable number.

1253055400221 is a deficient number, since it is larger than the sum of its proper divisors (417685133411).

1253055400221 is an equidigital number, since it uses as much as digits as its factorization.

1253055400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417685133410.

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 1253055400221 in words is "one trillion, two hundred fifty-three billion, fifty-five million, four hundred thousand, two hundred twenty-one".