21940068 has 24 divisors (see below), whose sum is σ = 53419968. Its totient is φ = 6995296.

The previous prime is 21940067. The next prime is 21940073. The reversal of 21940068 is 86004912.

It is not an unprimeable number, because it can be changed into a prime (21940063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39471 + ... + 40022.

It is an arithmetic number, because the mean of its divisors is an integer number (2225832).

Almost surely, 2^21940068 is an apocalyptic number.

It is an amenable number.

21940068 is an abundant number, since it is smaller than the sum of its proper divisors (31479900).

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

21940068 is a wasteful number, since it uses less digits than its factorization.

21940068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79523 (or 79521 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 21940068 is about 4684.0226301759. The cubic root of 21940068 is about 279.9492595130.

The spelling of 21940068 in words is "twenty-one million, nine hundred forty thousand, sixty-eight".