21339149225 has 6 divisors (see below), whose sum is σ = 26460545070. Its totient is φ = 17071319360.

The previous prime is 21339149203. The next prime is 21339149263. The reversal of 21339149225 is 52294193312.

It can be written as a sum of positive squares in 3 ways, for example, as 162205696 + 21176943529 = 12736^2 + 145523^2 .

It is not a de Polignac number, because 21339149225 - 2¹² = 21339145129 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 426782960 + ... + 426783009.

It is an arithmetic number, because the mean of its divisors is an integer number (4410090845).

Almost surely, 2^21339149225 is an apocalyptic number.

21339149225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21339149225 is a deficient number, since it is larger than the sum of its proper divisors (5121395845).

21339149225 is an equidigital number, since it uses as much as digits as its factorization.

21339149225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853565979 (or 853565974 counting only the distinct ones).

The product of its digits is 116640, while the sum is 41.

The spelling of 21339149225 in words is "twenty-one billion, three hundred thirty-nine million, one hundred forty-nine thousand, two hundred twenty-five".