21948125 has 10 divisors (see below), whose sum is σ = 27427158. Its totient is φ = 17558000.

The previous prime is 21948119. The next prime is 21948127. The reversal of 21948125 is 52184912.

It can be written as a sum of positive squares in 5 ways, for example, as 16662724 + 5285401 = 4082^2 + 2299^2 .

It is not a de Polignac number, because 21948125 - 2¹² = 21944029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21948091 and 21948100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21948127) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 16934 + ... + 18183.

Almost surely, 2^21948125 is an apocalyptic number.

21948125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21948125 is a deficient number, since it is larger than the sum of its proper divisors (5479033).

21948125 is an frugal number, since it uses more digits than its factorization.

21948125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35137 (or 35122 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 21948125 is about 4684.8826025846. The cubic root of 21948125 is about 279.9835236904.

The spelling of 21948125 in words is "twenty-one million, nine hundred forty-eight thousand, one hundred twenty-five".