21849552 has 30 divisors (see below), whose sum is σ = 61148802. Its totient is φ = 7283136.

The previous prime is 21849551. The next prime is 21849559. The reversal of 21849552 is 25594812.

21849552 is a `hidden beast` number, since 21 + 84 + 9 + 552 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20466576 + 1382976 = 4524^2 + 1176^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21849551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 75723 + ... + 76010.

Almost surely, 2^21849552 is an apocalyptic number.

It is an amenable number.

21849552 is an abundant number, since it is smaller than the sum of its proper divisors (39299250).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21849552 is a wasteful number, since it uses less digits than its factorization.

21849552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151747 (or 151738 counting only the distinct ones).

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

The square root of 21849552 is about 4674.3504361569. The cubic root of 21849552 is about 279.5637424050.

It can be divided in two parts, 218 and 49552, that added together give a triangular number (49770 = T₃₁₅).

The spelling of 21849552 in words is "twenty-one million, eight hundred forty-nine thousand, five hundred fifty-two".