21860743 has 6 divisors (see below), whose sum is σ = 22089632. Its totient is φ = 21634200.

The previous prime is 21860731. The next prime is 21860771. The reversal of 21860743 is 34706812.

It is not a de Polignac number, because 21860743 - 2⁵ = 21860711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21860243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9130 + ... + 11272.

Almost surely, 2^21860743 is an apocalyptic number.

21860743 is a deficient number, since it is larger than the sum of its proper divisors (228889).

21860743 is an equidigital number, since it uses as much as digits as its factorization.

21860743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2345 (or 2244 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21860743 is about 4675.5473476375. The cubic root of 21860743 is about 279.6114636558.

The spelling of 21860743 in words is "twenty-one million, eight hundred sixty thousand, seven hundred forty-three".