2555401021 has 4 divisors (see below), whose sum is σ = 2637833344. Its totient is φ = 2472968700.

The previous prime is 2555401007. The next prime is 2555401061. The reversal of 2555401021 is 1201045552.

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 a cyclic number.

It is not a de Polignac number, because 2555401021 - 2¹⁵ = 2555368253 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 (2555401061) 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, 41216115 + ... + 41216176.

It is an arithmetic number, because the mean of its divisors is an integer number (659458336).

Almost surely, 2^2555401021 is an apocalyptic number.

It is an amenable number.

2555401021 is a deficient number, since it is larger than the sum of its proper divisors (82432323).

2555401021 is an equidigital number, since it uses as much as digits as its factorization.

2555401021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82432322.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 2555401021 is about 50550.9744812105. The cubic root of 2555401021 is about 1367.1610846931.

Adding to 2555401021 its reverse (1201045552), we get a palindrome (3756446573).

The spelling of 2555401021 in words is "two billion, five hundred fifty-five million, four hundred one thousand, twenty-one".