21400022 has 32 divisors (see below), whose sum is σ = 37822464. Its totient is φ = 8892000.

The previous prime is 21400003. The next prime is 21400031. The reversal of 21400022 is 22000412.

It is a junction number, because it is equal to n+sod(n) for n = 21399976 and 21400012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111947 + ... + 112137.

It is an arithmetic number, because the mean of its divisors is an integer number (1181952).

Almost surely, 2^21400022 is an apocalyptic number.

21400022 is a deficient number, since it is larger than the sum of its proper divisors (16422442).

21400022 is a wasteful number, since it uses less digits than its factorization.

21400022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 21400022 is about 4626.0157803449. The cubic root of 21400022 is about 277.6332049936.

Adding to 21400022 its reverse (22000412), we get a palindrome (43400434).

The spelling of 21400022 in words is "twenty-one million, four hundred thousand, twenty-two".