21889876 has 6 divisors (see below), whose sum is σ = 38307290. Its totient is φ = 10944936.

The previous prime is 21889871. The next prime is 21889877. The reversal of 21889876 is 67898812.

It can be written as a sum of positive squares in only one way, i.e., 21399876 + 490000 = 4626^2 + 700^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21889871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2736231 + ... + 2736238.

Almost surely, 2^21889876 is an apocalyptic number.

It is an amenable number.

21889876 is a deficient number, since it is larger than the sum of its proper divisors (16417414).

21889876 is a wasteful number, since it uses less digits than its factorization.

21889876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5472473 (or 5472471 counting only the distinct ones).

The product of its digits is 387072, while the sum is 49.

The square root of 21889876 is about 4678.6617744821. The cubic root of 21889876 is about 279.7356177900.

The spelling of 21889876 in words is "twenty-one million, eight hundred eighty-nine thousand, eight hundred seventy-six".