21552814 has 4 divisors (see below), whose sum is σ = 32329224. Its totient is φ = 10776406.

The previous prime is 21552799. The next prime is 21552823. The reversal of 21552814 is 41825512.

It is a semiprime because it is the product of two primes.

It is a zygodrome in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5388202 + ... + 5388205.

It is an arithmetic number, because the mean of its divisors is an integer number (8082306).

Almost surely, 2^21552814 is an apocalyptic number.

21552814 is a deficient number, since it is larger than the sum of its proper divisors (10776410).

21552814 is a wasteful number, since it uses less digits than its factorization.

21552814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10776409.

The product of its digits is 3200, while the sum is 28.

The square root of 21552814 is about 4642.5008346795. The cubic root of 21552814 is about 278.2923877123.

It can be divided in two parts, 21552 and 814, that added together give a triangular number (22366 = T₂₁₁).

The spelling of 21552814 in words is "twenty-one million, five hundred fifty-two thousand, eight hundred fourteen".