21984122 has 4 divisors (see below), whose sum is σ = 32976186. Its totient is φ = 10992060.

The previous prime is 21984119. The next prime is 21984133. The reversal of 21984122 is 22148912.

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

It can be written as a sum of positive squares in only one way, i.e., 21911761 + 72361 = 4681^2 + 269^2 .

It is a super-2 number, since 2×21984122² = 966603240221768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5496029 + ... + 5496032.

Almost surely, 2^21984122 is an apocalyptic number.

21984122 is a deficient number, since it is larger than the sum of its proper divisors (10992064).

21984122 is a wasteful number, since it uses less digits than its factorization.

21984122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10992063.

The product of its digits is 2304, while the sum is 29.

The square root of 21984122 is about 4688.7228538270. The cubic root of 21984122 is about 280.1365065683.

The spelling of 21984122 in words is "twenty-one million, nine hundred eighty-four thousand, one hundred twenty-two".