21948525 has 18 divisors (see below), whose sum is σ = 39312650. Its totient is φ = 11705760.

The previous prime is 21948523. The next prime is 21948529. The reversal of 21948525 is 52584912.

It can be written as a sum of positive squares in 3 ways, for example, as 298116 + 21650409 = 546^2 + 4653^2 .

It is not a de Polignac number, because 21948525 - 2¹ = 21948523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21948525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21948523) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 48550 + ... + 48999.

Almost surely, 2^21948525 is an apocalyptic number.

21948525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21948525 is a deficient number, since it is larger than the sum of its proper divisors (17364125).

21948525 is a wasteful number, since it uses less digits than its factorization.

21948525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97565 (or 97557 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 21948525 is about 4684.9252928942. The cubic root of 21948525 is about 279.9852245605.

The spelling of 21948525 in words is "twenty-one million, nine hundred forty-eight thousand, five hundred twenty-five".