21922019 has 16 divisors (see below), whose sum is σ = 26232768. Its totient is φ = 17926272.

The previous prime is 21922009. The next prime is 21922037. The reversal of 21922019 is 91022912.

It is a happy number.

It is not a de Polignac number, because 21922019 - 2¹² = 21917923 is a prime.

It is a super-2 number, since 2×21922019² = 961149834072722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21922009) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 12929 + ... + 14525.

It is an arithmetic number, because the mean of its divisors is an integer number (1639548).

Almost surely, 2^21922019 is an apocalyptic number.

21922019 is a deficient number, since it is larger than the sum of its proper divisors (4310749).

21922019 is a wasteful number, since it uses less digits than its factorization.

21922019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 21922019 is about 4682.0955778369. The cubic root of 21922019 is about 279.8724716869.

The spelling of 21922019 in words is "twenty-one million, nine hundred twenty-two thousand, nineteen".