21292552 has 8 divisors (see below), whose sum is σ = 39923550. Its totient is φ = 10646272.

The previous prime is 21292543. The next prime is 21292553. The reversal of 21292552 is 25529212.

It can be written as a sum of positive squares in only one way, i.e., 19838116 + 1454436 = 4454^2 + 1206^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21292552.

It is not an unprimeable number, because it can be changed into a prime (21292553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330777 + ... + 1330792.

Almost surely, 2^21292552 is an apocalyptic number.

It is an amenable number.

21292552 is a deficient number, since it is larger than the sum of its proper divisors (18630998).

21292552 is a wasteful number, since it uses less digits than its factorization.

21292552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2661575 (or 2661571 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 21292552 is about 4614.3853328477. The cubic root of 21292552 is about 277.1676707763.

The spelling of 21292552 in words is "twenty-one million, two hundred ninety-two thousand, five hundred fifty-two".