21476943 has 12 divisors (see below), whose sum is σ = 31330728. Its totient is φ = 14175600.

The previous prime is 21476927. The next prime is 21476947. The reversal of 21476943 is 34967412.

It is not a de Polignac number, because 21476943 - 2⁴ = 21476927 is a prime.

It is a super-2 number, since 2×21476943² = 922518161250498, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21476898 and 21476907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21476947) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10905 + ... + 12722.

It is an arithmetic number, because the mean of its divisors is an integer number (2610894).

Almost surely, 2^21476943 is an apocalyptic number.

21476943 is a deficient number, since it is larger than the sum of its proper divisors (9853785).

21476943 is a wasteful number, since it uses less digits than its factorization.

21476943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23734 (or 23731 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 21476943 is about 4634.3222805498. The cubic root of 21476943 is about 277.9654521187.

The spelling of 21476943 in words is "twenty-one million, four hundred seventy-six thousand, nine hundred forty-three".