21949606 has 8 divisors (see below), whose sum is σ = 37627920. Its totient is φ = 9406968.

The previous prime is 21949559. The next prime is 21949633. The reversal of 21949606 is 60694912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 783901 + ... + 783928.

It is an arithmetic number, because the mean of its divisors is an integer number (4703490).

Almost surely, 2^21949606 is an apocalyptic number.

21949606 is a deficient number, since it is larger than the sum of its proper divisors (15678314).

21949606 is a wasteful number, since it uses less digits than its factorization.

21949606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1567838.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 21949606 is about 4685.0406615098. The cubic root of 21949606 is about 279.9898210585.

The spelling of 21949606 in words is "twenty-one million, nine hundred forty-nine thousand, six hundred six".