21983934 has 16 divisors (see below), whose sum is σ = 50249088. Its totient is φ = 6281112.

The previous prime is 21983933. The next prime is 21983947. The reversal of 21983934 is 43938912.

It is a junction number, because it is equal to n+sod(n) for n = 21983892 and 21983901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21983933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261672 + ... + 261755.

It is an arithmetic number, because the mean of its divisors is an integer number (3140568).

Almost surely, 2^21983934 is an apocalyptic number.

21983934 is an abundant number, since it is smaller than the sum of its proper divisors (28265154).

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

21983934 is a wasteful number, since it uses less digits than its factorization.

21983934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523439.

The product of its digits is 46656, while the sum is 39.

The square root of 21983934 is about 4688.7028056809. The cubic root of 21983934 is about 280.1357080251.

The spelling of 21983934 in words is "twenty-one million, nine hundred eighty-three thousand, nine hundred thirty-four".