21186022 has 16 divisors (see below), whose sum is σ = 37335312. Its totient is φ = 8889120.

The previous prime is 21186017. The next prime is 21186023. The reversal of 21186022 is 22068112.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21185984 and 21186002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21186023) 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, 36753 + ... + 37324.

It is an arithmetic number, because the mean of its divisors is an integer number (2333457).

Almost surely, 2^21186022 is an apocalyptic number.

21186022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21186022 is a deficient number, since it is larger than the sum of its proper divisors (16149290).

21186022 is a wasteful number, since it uses less digits than its factorization.

21186022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74103.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 21186022 is about 4602.8276091985. The cubic root of 21186022 is about 276.7046598684.

The spelling of 21186022 in words is "twenty-one million, one hundred eighty-six thousand, twenty-two".