21949146 has 24 divisors (see below), whose sum is σ = 47826324. Its totient is φ = 7274880.

The previous prime is 21949139. The next prime is 21949163. The reversal of 21949146 is 64194912.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19580625 + 2368521 = 4425^2 + 1539^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21949146.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111 + ... + 6626.

Almost surely, 2^21949146 is an apocalyptic number.

21949146 is an abundant number, since it is smaller than the sum of its proper divisors (25877178).

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

21949146 is a wasteful number, since it uses less digits than its factorization.

21949146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6926 (or 6923 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 21949146 is about 4684.9915688291. The cubic root of 21949146 is about 279.9878651204.

The spelling of 21949146 in words is "twenty-one million, nine hundred forty-nine thousand, one hundred forty-six".