21942473 has 16 divisors (see below), whose sum is σ = 27312000. Its totient is φ = 17200512.

The previous prime is 21942469. The next prime is 21942491. The reversal of 21942473 is 37424912.

It is not a de Polignac number, because 21942473 - 2² = 21942469 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21942673) 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, 1013 + ... + 6701.

It is an arithmetic number, because the mean of its divisors is an integer number (1707000).

Almost surely, 2^21942473 is an apocalyptic number.

It is an amenable number.

21942473 is a deficient number, since it is larger than the sum of its proper divisors (5369527).

21942473 is a wasteful number, since it uses less digits than its factorization.

21942473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5744.

The product of its digits is 12096, while the sum is 32.

The square root of 21942473 is about 4684.2793469220. The cubic root of 21942473 is about 279.9594881864.

The spelling of 21942473 in words is "twenty-one million, nine hundred forty-two thousand, four hundred seventy-three".