21454051225 has 12 divisors (see below), whose sum is σ = 27169046784. Its totient is φ = 16798064720.

The previous prime is 21454051193. The next prime is 21454051243. The reversal of 21454051225 is 52215045412.

It is not a de Polignac number, because 21454051225 - 2⁵ = 21454051193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9128209 + ... + 9130558.

It is an arithmetic number, because the mean of its divisors is an integer number (2264087232).

Almost surely, 2^21454051225 is an apocalyptic number.

21454051225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21454051225 is a deficient number, since it is larger than the sum of its proper divisors (5714995559).

21454051225 is a wasteful number, since it uses less digits than its factorization.

21454051225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18258824 (or 18258819 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 31.

Adding to 21454051225 its reverse (52215045412), we get a palindrome (73669096637).

The spelling of 21454051225 in words is "twenty-one billion, four hundred fifty-four million, fifty-one thousand, two hundred twenty-five".