21262140225 has 24 divisors (see below), whose sum is σ = 39059340320. Its totient is φ = 11339807760.

The previous prime is 21262140161. The next prime is 21262140241. The reversal of 21262140225 is 52204126212.

21262140225 is a `hidden beast` number, since 2 + 12 + 621 + 4 + 0 + 2 + 25 = 666.

It is not a de Polignac number, because 21262140225 - 2⁶ = 21262140161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 15749059 + ... + 15750408.

Almost surely, 2^21262140225 is an apocalyptic number.

21262140225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21262140225 is a deficient number, since it is larger than the sum of its proper divisors (17797200095).

21262140225 is a wasteful number, since it uses less digits than its factorization.

21262140225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31499486 (or 31499475 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 21262140225 its reverse (52204126212), we get a palindrome (73466266437).

The spelling of 21262140225 in words is "twenty-one billion, two hundred sixty-two million, one hundred forty thousand, two hundred twenty-five".