21670850 has 24 divisors (see below), whose sum is σ = 40570320. Its totient is φ = 8611920.

The previous prime is 21670819. The next prime is 21670861. The reversal of 21670850 is 5807612.

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, 6821 + ... + 9479.

It is an arithmetic number, because the mean of its divisors is an integer number (1690430).

Almost surely, 2^21670850 is an apocalyptic number.

21670850 is a deficient number, since it is larger than the sum of its proper divisors (18899470).

21670850 is a wasteful number, since it uses less digits than its factorization.

21670850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2834 (or 2829 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 21670850 is about 4655.1960216515. The cubic root of 21670850 is about 278.7994945192.

The spelling of 21670850 in words is "twenty-one million, six hundred seventy thousand, eight hundred fifty".