21421322 has 32 divisors (see below), whose sum is σ = 36865920. Its totient is φ = 9253440.

The previous prime is 21421319. The next prime is 21421333. The reversal of 21421322 is 22312412.

It is a self number, because there is not a number n which added to its sum of digits gives 21421322.

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, 50672 + ... + 51092.

It is an arithmetic number, because the mean of its divisors is an integer number (1152060).

Almost surely, 2^21421322 is an apocalyptic number.

21421322 is a deficient number, since it is larger than the sum of its proper divisors (15444598).

21421322 is a wasteful number, since it uses less digits than its factorization.

21421322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558.

The product of its digits is 192, while the sum is 17.

The square root of 21421322 is about 4628.3174048460. The cubic root of 21421322 is about 277.7252863065.

Adding to 21421322 its reverse (22312412), we get a palindrome (43733734).

The spelling of 21421322 in words is "twenty-one million, four hundred twenty-one thousand, three hundred twenty-two".