253542541421 has 4 divisors (see below), whose sum is σ = 273045813852. Its totient is φ = 234039268992.

The previous prime is 253542541393. The next prime is 253542541423. The reversal of 253542541421 is 124145245352.

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 15067562500 + 238474978921 = 122750^2 + 488339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253542541421 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 (253542541423) 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, 9751636196 + ... + 9751636221.

It is an arithmetic number, because the mean of its divisors is an integer number (68261453463).

Almost surely, 2^253542541421 is an apocalyptic number.

It is an amenable number.

253542541421 is a deficient number, since it is larger than the sum of its proper divisors (19503272431).

253542541421 is a wasteful number, since it uses less digits than its factorization.

253542541421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19503272430.

The product of its digits is 192000, while the sum is 38.

Adding to 253542541421 its reverse (124145245352), we get a palindrome (377687786773).

The spelling of 253542541421 in words is "two hundred fifty-three billion, five hundred forty-two million, five hundred forty-one thousand, four hundred twenty-one".