21101822 has 24 divisors (see below), whose sum is σ = 36883056. Its totient is φ = 8869824.

The previous prime is 21101819. The next prime is 21101849. The reversal of 21101822 is 22810112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21101822.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48518 + ... + 48950.

It is an arithmetic number, because the mean of its divisors is an integer number (1536794).

Almost surely, 2^21101822 is an apocalyptic number.

21101822 is a deficient number, since it is larger than the sum of its proper divisors (15781234).

21101822 is an equidigital number, since it uses as much as digits as its factorization.

21101822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560 (or 501 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 21101822 is about 4593.6719517179. The cubic root of 21101822 is about 276.3376023504.

Adding to 21101822 its reverse (22810112), we get a palindrome (43911934).

The spelling of 21101822 in words is "twenty-one million, one hundred one thousand, eight hundred twenty-two".