21479841583225 has 27 divisors (see below), whose sum is σ = 27585985656333. Its totient is φ = 16590806833440.

The previous prime is 21479841583127. The next prime is 21479841583229. The reversal of 21479841583225 is 52238514897412.

The square root of 21479841583225 is 4634635.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 295252043641 + 21184589539584 = 543371^2 + 4602672^2 .

It is not a de Polignac number, because 21479841583225 - 2⁴³ = 12683748561017 is a prime.

It is a super-2 number, since 2×21479841583225² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21479841583229) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 672006094 + ... + 672038056.

Almost surely, 2^{21479841583225} is an apocalyptic number.

21479841583225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21479841583225 is the 4634635-th square number.

21479841583225 is the 2317318-th centered octagonal number.

It is an amenable number.

21479841583225 is a deficient number, since it is larger than the sum of its proper divisors (6106144073108).

21479841583225 is an frugal number, since it uses more digits than its factorization.

21479841583225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63994 (or 31997 counting only the distinct ones).

The product of its digits is 38707200, while the sum is 61.

The spelling of 21479841583225 in words is "twenty-one trillion, four hundred seventy-nine billion, eight hundred forty-one million, five hundred eighty-three thousand, two hundred twenty-five".