21983870 has 16 divisors (see below), whose sum is σ = 40318560. Its totient is φ = 8627424.

The previous prime is 21983869. The next prime is 21983881. The reversal of 21983870 is 7838912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20210 + ... + 21269.

It is an arithmetic number, because the mean of its divisors is an integer number (2519910).

Almost surely, 2^21983870 is an apocalyptic number.

21983870 is a deficient number, since it is larger than the sum of its proper divisors (18334690).

21983870 is a wasteful number, since it uses less digits than its factorization.

21983870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41539.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 21983870 is about 4688.6959807605. The cubic root of 21983870 is about 280.1354361796.

The spelling of 21983870 in words is "twenty-one million, nine hundred eighty-three thousand, eight hundred seventy".