21455040410254 has 16 divisors (see below), whose sum is σ = 35108336503296. Its totient is φ = 9752266495800.

The previous prime is 21455040410239. The next prime is 21455040410261. The reversal of 21455040410254 is 45201404055412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9946819 + ... + 11910049.

It is an arithmetic number, because the mean of its divisors is an integer number (2194271031456).

Almost surely, 2^{21455040410254} is an apocalyptic number.

21455040410254 is a deficient number, since it is larger than the sum of its proper divisors (13653296093042).

21455040410254 is a wasteful number, since it uses less digits than its factorization.

21455040410254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2459991.

The product of its (nonzero) digits is 128000, while the sum is 37.

Adding to 21455040410254 its reverse (45201404055412), we get a palindrome (66656444465666).

The spelling of 21455040410254 in words is "twenty-one trillion, four hundred fifty-five billion, forty million, four hundred ten thousand, two hundred fifty-four".