21132422 has 8 divisors (see below), whose sum is σ = 32373216. Its totient is φ = 10341352.

The previous prime is 21132383. The next prime is 21132481. The reversal of 21132422 is 22423112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21132422.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112313 + ... + 112500.

It is an arithmetic number, because the mean of its divisors is an integer number (4046652).

Almost surely, 2^21132422 is an apocalyptic number.

21132422 is a deficient number, since it is larger than the sum of its proper divisors (11240794).

21132422 is a wasteful number, since it uses less digits than its factorization.

21132422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224862.

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

The square root of 21132422 is about 4597.0014139654. The cubic root of 21132422 is about 276.4711113048.

Adding to 21132422 its reverse (22423112), we get a palindrome (43555534).

The spelling of 21132422 in words is "twenty-one million, one hundred thirty-two thousand, four hundred twenty-two".