21862023 has 16 divisors (see below), whose sum is σ = 29859840. Its totient is φ = 14222624.

The previous prime is 21861991. The next prime is 21862031. The reversal of 21862023 is 32026812.

It is a cyclic number.

It is not a de Polignac number, because 21862023 - 2⁵ = 21861991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21861984 and 21862002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21862063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56890 + ... + 57272.

It is an arithmetic number, because the mean of its divisors is an integer number (1866240).

Almost surely, 2^21862023 is an apocalyptic number.

21862023 is a deficient number, since it is larger than the sum of its proper divisors (7997817).

21862023 is a wasteful number, since it uses less digits than its factorization.

21862023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21862023 is about 4675.6842280034. The cubic root of 21862023 is about 279.6169208611.

Adding to 21862023 its reverse (32026812), we get a palindrome (53888835).

The spelling of 21862023 in words is "twenty-one million, eight hundred sixty-two thousand, twenty-three".