21967434 has 24 divisors (see below), whose sum is σ = 50396580. Its totient is φ = 6891648.

The previous prime is 21967433. The next prime is 21967441. The reversal of 21967434 is 43476912.

21967434 is a `hidden beast` number, since 219 + 6 + 7 + 434 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21762225 + 205209 = 4665^2 + 453^2 .

It is not an unprimeable number, because it can be changed into a prime (21967433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35589 + ... + 36200.

Almost surely, 2^21967434 is an apocalyptic number.

21967434 is an abundant number, since it is smaller than the sum of its proper divisors (28429146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21967434 is a wasteful number, since it uses less digits than its factorization.

21967434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71814 (or 71811 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 21967434 is about 4686.9429268981. The cubic root of 21967434 is about 280.0656053754.

The spelling of 21967434 in words is "twenty-one million, nine hundred sixty-seven thousand, four hundred thirty-four".