21479996 has 6 divisors (see below), whose sum is σ = 37590000. Its totient is φ = 10739996.

The previous prime is 21479963. The next prime is 21480001. The reversal of 21479996 is 69997412.

It is a super-2 number, since 2×21479996² = 922780456320032, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21479996.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2684996 + ... + 2685003.

It is an arithmetic number, because the mean of its divisors is an integer number (6265000).

Almost surely, 2^21479996 is an apocalyptic number.

It is an amenable number.

21479996 is a deficient number, since it is larger than the sum of its proper divisors (16110004).

21479996 is a wasteful number, since it uses less digits than its factorization.

21479996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5370003 (or 5370001 counting only the distinct ones).

The product of its digits is 244944, while the sum is 47.

The square root of 21479996 is about 4634.6516589707. The cubic root of 21479996 is about 277.9786226510.

The spelling of 21479996 in words is "twenty-one million, four hundred seventy-nine thousand, nine hundred ninety-six".