21967736 has 16 divisors (see below), whose sum is σ = 47073840. Its totient is φ = 9414720.

The previous prime is 21967733. The next prime is 21967739. The reversal of 21967736 is 63776912.

It is an interprime number because it is at equal distance from previous prime (21967733) and next prime (21967739).

It is a junction number, because it is equal to n+sod(n) for n = 21967693 and 21967702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21967733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196085 + ... + 196196.

It is an arithmetic number, because the mean of its divisors is an integer number (2942115).

Almost surely, 2^21967736 is an apocalyptic number.

It is an amenable number.

21967736 is an abundant number, since it is smaller than the sum of its proper divisors (25106104).

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

21967736 is a wasteful number, since it uses less digits than its factorization.

21967736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392294 (or 392290 counting only the distinct ones).

The product of its digits is 95256, while the sum is 41.

The square root of 21967736 is about 4686.9751439495. The cubic root of 21967736 is about 280.0668887817.

The spelling of 21967736 in words is "twenty-one million, nine hundred sixty-seven thousand, seven hundred thirty-six".