21996273 has 16 divisors (see below), whose sum is σ = 31840256. Its totient is φ = 13426560.

The previous prime is 21996269. The next prime is 21996277. The reversal of 21996273 is 37269912.

It is an interprime number because it is at equal distance from previous prime (21996269) and next prime (21996277).

It is not a de Polignac number, because 21996273 - 2² = 21996269 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21996277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2733 + ... + 7173.

It is an arithmetic number, because the mean of its divisors is an integer number (1990016).

Almost surely, 2^21996273 is an apocalyptic number.

It is an amenable number.

21996273 is a deficient number, since it is larger than the sum of its proper divisors (9843983).

21996273 is a wasteful number, since it uses less digits than its factorization.

21996273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4584.

The product of its digits is 40824, while the sum is 39.

The square root of 21996273 is about 4690.0184434605. The cubic root of 21996273 is about 280.1881091407.

The spelling of 21996273 in words is "twenty-one million, nine hundred ninety-six thousand, two hundred seventy-three".