21889036 has 24 divisors (see below), whose sum is σ = 41383440. Its totient is φ = 10070592.

The previous prime is 21889019. The next prime is 21889061. The reversal of 21889036 is 63098812.

21889036 is a nontrivial binomial coefficient, being equal to C(6617, 2).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21888986 and 21889004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26055 + ... + 26881.

It is an arithmetic number, because the mean of its divisors is an integer number (1724310).

Almost surely, 2^21889036 is an apocalyptic number.

21889036 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21889036 is the 6616-th triangular number.

21889036 is the 2206-th centered nonagonal number.

It is an amenable number.

21889036 is a deficient number, since it is larger than the sum of its proper divisors (19494404).

21889036 is a wasteful number, since it uses less digits than its factorization.

21889036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353 (or 1351 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 21889036 is about 4678.5720043620. The cubic root of 21889036 is about 279.7320395616.

The spelling of 21889036 in words is "twenty-one million, eight hundred eighty-nine thousand, thirty-six".