21135422 has 32 divisors (see below), whose sum is σ = 40103424. Its totient is φ = 8114400.

The previous prime is 21135421. The next prime is 21135431. The reversal of 21135422 is 22453112.

It is a junction number, because it is equal to n+sod(n) for n = 21135394 and 21135403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21135421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9968 + ... + 11900.

It is an arithmetic number, because the mean of its divisors is an integer number (1253232).

Almost surely, 2^21135422 is an apocalyptic number.

21135422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21135422 is a deficient number, since it is larger than the sum of its proper divisors (18968002).

21135422 is a wasteful number, since it uses less digits than its factorization.

21135422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2024.

The product of its digits is 480, while the sum is 20.

The square root of 21135422 is about 4597.3277020460. The cubic root of 21135422 is about 276.4841934792.

Adding to 21135422 its reverse (22453112), we get a palindrome (43588534).

The spelling of 21135422 in words is "twenty-one million, one hundred thirty-five thousand, four hundred twenty-two".