21869546 has 4 divisors (see below), whose sum is σ = 32804322. Its totient is φ = 10934772.

The previous prime is 21869521. The next prime is 21869557. The reversal of 21869546 is 64596812.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 11978521 + 9891025 = 3461^2 + 3145^2 .

It is a super-2 number, since 2×21869546² = 956554084492232, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5467385 + ... + 5467388.

Almost surely, 2^21869546 is an apocalyptic number.

21869546 is a deficient number, since it is larger than the sum of its proper divisors (10934776).

21869546 is a wasteful number, since it uses less digits than its factorization.

21869546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10934775.

The product of its digits is 103680, while the sum is 41.

The square root of 21869546 is about 4676.4886399948. The cubic root of 21869546 is about 279.6489904284.

The spelling of 21869546 in words is "twenty-one million, eight hundred sixty-nine thousand, five hundred forty-six".