21862427 has 4 divisors (see below), whose sum is σ = 21877536. Its totient is φ = 21847320.

The previous prime is 21862417. The next prime is 21862429. The reversal of 21862427 is 72426812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21862427 - 2⁴ = 21862411 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21862393 and 21862402.

It is not an unprimeable number, because it can be changed into a prime (21862429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5123 + ... + 8364.

It is an arithmetic number, because the mean of its divisors is an integer number (5469384).

Almost surely, 2^21862427 is an apocalyptic number.

21862427 is a deficient number, since it is larger than the sum of its proper divisors (15109).

21862427 is a wasteful number, since it uses less digits than its factorization.

21862427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15108.

The product of its digits is 10752, while the sum is 32.

The square root of 21862427 is about 4675.7274300370. The cubic root of 21862427 is about 279.6186432473.

The spelling of 21862427 in words is "twenty-one million, eight hundred sixty-two thousand, four hundred twenty-seven".