21959954 has 12 divisors (see below), whose sum is σ = 34992474. Its totient is φ = 10333824.

The previous prime is 21959941. The next prime is 21959957. The reversal of 21959954 is 45995912.

It can be written as a sum of positive squares in 3 ways, for example, as 18292729 + 3667225 = 4277^2 + 1915^2 .

It is not an unprimeable number, because it can be changed into a prime (21959957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18419 + ... + 19574.

Almost surely, 2^21959954 is an apocalyptic number.

21959954 is a deficient number, since it is larger than the sum of its proper divisors (13032520).

21959954 is a wasteful number, since it uses less digits than its factorization.

21959954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38029 (or 38012 counting only the distinct ones).

The product of its digits is 145800, while the sum is 44.

The square root of 21959954 is about 4686.1448974610. The cubic root of 21959954 is about 280.0338139435.

The spelling of 21959954 in words is "twenty-one million, nine hundred fifty-nine thousand, nine hundred fifty-four".