21235101425 has 12 divisors (see below), whose sum is σ = 26333493120. Its totient is φ = 16986811920.

The previous prime is 21235101397. The next prime is 21235101431. The reversal of 21235101425 is 52410153212.

It is not a de Polignac number, because 21235101425 - 2⁶ = 21235101361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21235101394 and 21235101403.

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, 457436 + ... + 501714.

It is an arithmetic number, because the mean of its divisors is an integer number (2194457760).

Almost surely, 2^21235101425 is an apocalyptic number.

21235101425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21235101425 is a deficient number, since it is larger than the sum of its proper divisors (5098391695).

21235101425 is a wasteful number, since it uses less digits than its factorization.

21235101425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63472 (or 63467 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21235101425 its reverse (52410153212), we get a palindrome (73645254637).

The spelling of 21235101425 in words is "twenty-one billion, two hundred thirty-five million, one hundred one thousand, four hundred twenty-five".