21122066 has 8 divisors (see below), whose sum is σ = 36209280. Its totient is φ = 9052308.

The previous prime is 21122033. The next prime is 21122069. The reversal of 21122066 is 66022112.

It is a happy number.

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

It is a super-2 number, since 2×21122066² = 892283344216712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 754346 + ... + 754373.

It is an arithmetic number, because the mean of its divisors is an integer number (4526160).

Almost surely, 2^21122066 is an apocalyptic number.

21122066 is a deficient number, since it is larger than the sum of its proper divisors (15087214).

21122066 is a wasteful number, since it uses less digits than its factorization.

21122066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508728.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21122066 is about 4595.8748895069. The cubic root of 21122066 is about 276.4259421227.

Adding to 21122066 its reverse (66022112), we get a palindrome (87144178).

The spelling of 21122066 in words is "twenty-one million, one hundred twenty-two thousand, sixty-six".