21976706 has 8 divisors (see below), whose sum is σ = 34028544. Its totient is φ = 10633860.

The previous prime is 21976687. The next prime is 21976727. The reversal of 21976706 is 60767912.

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

It is a super-2 number, since 2×21976706² = 965951213220872, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21976706.

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, 177170 + ... + 177293.

It is an arithmetic number, because the mean of its divisors is an integer number (4253568).

Almost surely, 2^21976706 is an apocalyptic number.

21976706 is a deficient number, since it is larger than the sum of its proper divisors (12051838).

21976706 is a wasteful number, since it uses less digits than its factorization.

21976706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354496.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 21976706 is about 4687.9319534311. The cubic root of 21976706 is about 280.1050031347.

The spelling of 21976706 in words is "twenty-one million, nine hundred seventy-six thousand, seven hundred six".