22821506 has 4 divisors (see below), whose sum is σ = 34232262. Its totient is φ = 11410752.

The previous prime is 22821499. The next prime is 22821511. The reversal of 22821506 is 60512822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60512822 = 2 ⋅30256411.

It can be written as a sum of positive squares in only one way, i.e., 22705225 + 116281 = 4765^2 + 341^2 .

It is a super-2 number, since 2×22821506² = 1041642272216072, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5705375 + ... + 5705378.

Almost surely, 2^22821506 is an apocalyptic number.

22821506 is a deficient number, since it is larger than the sum of its proper divisors (11410756).

22821506 is a wasteful number, since it uses less digits than its factorization.

22821506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11410755.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 22821506 is about 4777.1859917738. The cubic root of 22821506 is about 283.6491153580.

The spelling of 22821506 in words is "twenty-two million, eight hundred twenty-one thousand, five hundred six".