21874034 has 32 divisors (see below), whose sum is σ = 41696256. Its totient is φ = 8372160.

The previous prime is 21874009. The next prime is 21874037. The reversal of 21874034 is 43047812.

It is a junction number, because it is equal to n+sod(n) for n = 21873988 and 21874006.

It is not an unprimeable number, because it can be changed into a prime (21874037) 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, 3704 + ... + 7580.

It is an arithmetic number, because the mean of its divisors is an integer number (1303008).

Almost surely, 2^21874034 is an apocalyptic number.

21874034 is a deficient number, since it is larger than the sum of its proper divisors (19822222).

21874034 is a wasteful number, since it uses less digits than its factorization.

21874034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3930.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 21874034 is about 4676.9684625834. The cubic root of 21874034 is about 279.6681186844.

Subtracting 21874034 from its reverse (43047812), we obtain a triangular number (21173778 = T₆₅₀₇).

The spelling of 21874034 in words is "twenty-one million, eight hundred seventy-four thousand, thirty-four".