21863274 has 16 divisors (see below), whose sum is σ = 45234720. Its totient is φ = 7036400.

The previous prime is 21863273. The next prime is 21863287. The reversal of 21863274 is 47236812.

It is not an unprimeable number, because it can be changed into a prime (21863273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62652 + ... + 62999.

It is an arithmetic number, because the mean of its divisors is an integer number (2827170).

Almost surely, 2^21863274 is an apocalyptic number.

21863274 is an abundant number, since it is smaller than the sum of its proper divisors (23371446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21863274 is a wasteful number, since it uses less digits than its factorization.

21863274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125685.

The product of its digits is 16128, while the sum is 33.

The square root of 21863274 is about 4675.8180033017. The cubic root of 21863274 is about 279.6222542208.

It can be divided in two parts, 2186 and 3274, that added together give a triangular number (5460 = T₁₀₄).

The spelling of 21863274 in words is "twenty-one million, eight hundred sixty-three thousand, two hundred seventy-four".