21964126 has 12 divisors (see below), whose sum is σ = 34428456. Its totient is φ = 10489380.

The previous prime is 21964123. The next prime is 21964147. The reversal of 21964126 is 62146912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21964123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31441 + ... + 32131.

It is an arithmetic number, because the mean of its divisors is an integer number (2869038).

Almost surely, 2^21964126 is an apocalyptic number.

21964126 is a deficient number, since it is larger than the sum of its proper divisors (12464330).

21964126 is an frugal number, since it uses more digits than its factorization.

21964126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407 (or 716 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 21964126 is about 4686.5900183396. The cubic root of 21964126 is about 280.0515466324.

The spelling of 21964126 in words is "twenty-one million, nine hundred sixty-four thousand, one hundred twenty-six".