21254419225 has 48 divisors (see below), whose sum is σ = 28687538880. Its totient is φ = 15527865600.

The previous prime is 21254419213. The next prime is 21254419243. The reversal of 21254419225 is 52291445212.

It is not a de Polignac number, because 21254419225 - 2⁷ = 21254419097 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19881991 + ... + 19883059.

It is an arithmetic number, because the mean of its divisors is an integer number (597657060).

Almost surely, 2^21254419225 is an apocalyptic number.

21254419225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21254419225 is a deficient number, since it is larger than the sum of its proper divisors (7433119655).

21254419225 is a wasteful number, since it uses less digits than its factorization.

21254419225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690 (or 1685 counting only the distinct ones).

The product of its digits is 57600, while the sum is 37.

The spelling of 21254419225 in words is "twenty-one billion, two hundred fifty-four million, four hundred nineteen thousand, two hundred twenty-five".