21433876 has 6 divisors (see below), whose sum is σ = 37509290. Its totient is φ = 10716936.

The previous prime is 21433873. The next prime is 21433883. The reversal of 21433876 is 67833412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17023876 + 4410000 = 4126^2 + 2100^2 .

It is a super-2 number, since 2×21433876² = 918822080766752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2679231 + ... + 2679238.

Almost surely, 2^21433876 is an apocalyptic number.

It is an amenable number.

21433876 is a deficient number, since it is larger than the sum of its proper divisors (16075414).

21433876 is a wasteful number, since it uses less digits than its factorization.

21433876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5358473 (or 5358471 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 21433876 is about 4629.6734226077. The cubic root of 21433876 is about 277.7795294941.

The spelling of 21433876 in words is "twenty-one million, four hundred thirty-three thousand, eight hundred seventy-six".