1255341501021 has 4 divisors (see below), whose sum is σ = 1673788668032. Its totient is φ = 836894334012.

The previous prime is 1255341500977. The next prime is 1255341501083. The reversal of 1255341501021 is 1201051435521.

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 1255341501021 - 2²¹ = 1255339403869 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1255341501021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255341501091) 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, 209223583501 + ... + 209223583506.

It is an arithmetic number, because the mean of its divisors is an integer number (418447167008).

Almost surely, 2^{1255341501021} is an apocalyptic number.

It is an amenable number.

1255341501021 is a deficient number, since it is larger than the sum of its proper divisors (418447167011).

1255341501021 is an equidigital number, since it uses as much as digits as its factorization.

1255341501021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418447167010.

The product of its (nonzero) digits is 6000, while the sum is 30.

Adding to 1255341501021 its reverse (1201051435521), we get a palindrome (2456392936542).

The spelling of 1255341501021 in words is "one trillion, two hundred fifty-five billion, three hundred forty-one million, five hundred one thousand, twenty-one".