21999076 has 12 divisors (see below), whose sum is σ = 41998320. Its totient is φ = 9999560.

The previous prime is 21999073. The next prime is 21999079. The reversal of 21999076 is 67099912.

It is an interprime number because it is at equal distance from previous prime (21999073) and next prime (21999079).

It is not an unprimeable number, because it can be changed into a prime (21999073) 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, 249946 + ... + 250033.

It is an arithmetic number, because the mean of its divisors is an integer number (3499860).

Almost surely, 2^21999076 is an apocalyptic number.

It is an amenable number.

21999076 is a deficient number, since it is larger than the sum of its proper divisors (19999244).

21999076 is a wasteful number, since it uses less digits than its factorization.

21999076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499994 (or 499992 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 21999076 is about 4690.3172600582. The cubic root of 21999076 is about 280.2000101556.

The spelling of 21999076 in words is "twenty-one million, nine hundred ninety-nine thousand, seventy-six".