21235754225 has 48 divisors (see below), whose sum is σ = 32450839680. Its totient is φ = 13458700800.

The previous prime is 21235754209. The next prime is 21235754227. The reversal of 21235754225 is 52245753212.

21235754225 is nontrivially palindromic in base 4.

It is not a de Polignac number, because 21235754225 - 2⁴ = 21235754209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21235754227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58439 + ... + 214211.

It is an arithmetic number, because the mean of its divisors is an integer number (676059160).

Almost surely, 2^21235754225 is an apocalyptic number.

21235754225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21235754225 is a deficient number, since it is larger than the sum of its proper divisors (11215085455).

21235754225 is a wasteful number, since it uses less digits than its factorization.

21235754225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155850 (or 155845 counting only the distinct ones).

The product of its digits is 168000, while the sum is 38.

The spelling of 21235754225 in words is "twenty-one billion, two hundred thirty-five million, seven hundred fifty-four thousand, two hundred twenty-five".