21932219 has 2 divisors, whose sum is σ = 21932220. Its totient is φ = 21932218.

The previous prime is 21932203. The next prime is 21932233. The reversal of 21932219 is 91223912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21932219 - 2⁴ = 21932203 is a prime.

It is a super-2 number, since 2×21932219² = 962044460527922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21932191 and 21932200.

It is not a weakly prime, because it can be changed into another prime (21932269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10966109 + 10966110.

It is an arithmetic number, because the mean of its divisors is an integer number (10966110).

Almost surely, 2^21932219 is an apocalyptic number.

21932219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21932219 is an equidigital number, since it uses as much as digits as its factorization.

21932219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 29.

The square root of 21932219 is about 4683.1847070130. The cubic root of 21932219 is about 279.9158718344.

The spelling of 21932219 in words is "twenty-one million, nine hundred thirty-two thousand, two hundred nineteen".