254155221021 has 16 divisors (see below), whose sum is σ = 367726645440. Its totient is φ = 155209292160.

The previous prime is 254155221011. The next prime is 254155221041. The reversal of 254155221021 is 120122551452.

It is not a de Polignac number, because 254155221021 - 2²³ = 254146832413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 254155221021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (254155221011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24868176 + ... + 24878393.

It is an arithmetic number, because the mean of its divisors is an integer number (22982915340).

Almost surely, 2^254155221021 is an apocalyptic number.

It is an amenable number.

254155221021 is a deficient number, since it is larger than the sum of its proper divisors (113571424419).

254155221021 is a wasteful number, since it uses less digits than its factorization.

254155221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49746716.

The product of its (nonzero) digits is 8000, while the sum is 30.

Adding to 254155221021 its reverse (120122551452), we get a palindrome (374277772473).

The spelling of 254155221021 in words is "two hundred fifty-four billion, one hundred fifty-five million, two hundred twenty-one thousand, twenty-one".