21554552 has 16 divisors (see below), whose sum is σ = 40521600. Its totient is φ = 10748800.

The previous prime is 21554543. The next prime is 21554557. The reversal of 21554552 is 25545512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152 + ... + 6567.

It is an arithmetic number, because the mean of its divisors is an integer number (2532600).

Almost surely, 2^21554552 is an apocalyptic number.

It is an amenable number.

21554552 is a deficient number, since it is larger than the sum of its proper divisors (18967048).

21554552 is a wasteful number, since it uses less digits than its factorization.

21554552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7126 (or 7122 counting only the distinct ones).

The product of its digits is 10000, while the sum is 29.

The square root of 21554552 is about 4642.6880145019. The cubic root of 21554552 is about 278.2998679292.

The spelling of 21554552 in words is "twenty-one million, five hundred fifty-four thousand, five hundred fifty-two".