21980699 has 8 divisors (see below), whose sum is σ = 23736720. Its totient is φ = 20234016.

The previous prime is 21980687. The next prime is 21980719. The reversal of 21980699 is 99608912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21980699 - 2⁴ = 21980683 is a prime.

It is a super-2 number, since 2×21980699² = 966302257057202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21980659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3032 + ... + 7290.

It is an arithmetic number, because the mean of its divisors is an integer number (2967090).

Almost surely, 2^21980699 is an apocalyptic number.

21980699 is a deficient number, since it is larger than the sum of its proper divisors (1756021).

21980699 is a wasteful number, since it uses less digits than its factorization.

21980699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4669.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 21980699 is about 4688.3578148431. The cubic root of 21980699 is about 280.1219664222.

The spelling of 21980699 in words is "twenty-one million, nine hundred eighty thousand, six hundred ninety-nine".