21021422 has 4 divisors (see below), whose sum is σ = 31532136. Its totient is φ = 10510710.

The previous prime is 21021419. The next prime is 21021431. The reversal of 21021422 is 22412012.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21021397 and 21021406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255354 + ... + 5255357.

It is an arithmetic number, because the mean of its divisors is an integer number (7883034).

Almost surely, 2^21021422 is an apocalyptic number.

21021422 is a deficient number, since it is larger than the sum of its proper divisors (10510714).

21021422 is a wasteful number, since it uses less digits than its factorization.

21021422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10510713.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21021422 is about 4584.9124310067. The cubic root of 21021422 is about 275.9861979375.

Adding to 21021422 its reverse (22412012), we get a palindrome (43433434).

The spelling of 21021422 in words is "twenty-one million, twenty-one thousand, four hundred twenty-two".