21076552 has 32 divisors (see below), whose sum is σ = 45460800. Its totient is φ = 8973504.

The previous prime is 21076547. The next prime is 21076553. The reversal of 21076552 is 25567012.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 21076552.

It is not an unprimeable number, because it can be changed into a prime (21076553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7974 + ... + 10282.

It is an arithmetic number, because the mean of its divisors is an integer number (1420650).

Almost surely, 2^21076552 is an apocalyptic number.

It is an amenable number.

21076552 is an abundant number, since it is smaller than the sum of its proper divisors (24384248).

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

21076552 is a wasteful number, since it uses less digits than its factorization.

21076552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2485 (or 2481 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 21076552 is about 4590.9206048460. The cubic root of 21076552 is about 276.2272510494.

The spelling of 21076552 in words is "twenty-one million, seventy-six thousand, five hundred fifty-two".