21254543025 has 24 divisors (see below), whose sum is σ = 35212475424. Its totient is φ = 11312649600.

The previous prime is 21254543003. The next prime is 21254543047. The reversal of 21254543025 is 52034545212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21254543003) and next prime (21254543047).

It is not a de Polignac number, because 21254543025 - 2¹¹ = 21254540977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 251764 + ... + 325413.

It is an arithmetic number, because the mean of its divisors is an integer number (1467186476).

Almost surely, 2^21254543025 is an apocalyptic number.

21254543025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21254543025 is a deficient number, since it is larger than the sum of its proper divisors (13957932399).

21254543025 is a wasteful number, since it uses less digits than its factorization.

21254543025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577681 (or 577676 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 33.

The spelling of 21254543025 in words is "twenty-one billion, two hundred fifty-four million, five hundred forty-three thousand, twenty-five".