21032374 has 16 divisors (see below), whose sum is σ = 34525440. Its totient is φ = 9529960.

The previous prime is 21032371. The next prime is 21032387. The reversal of 21032374 is 47323012.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032371) 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 7 ways as a sum of consecutive naturals, for example, 6567 + ... + 9229.

It is an arithmetic number, because the mean of its divisors is an integer number (2157840).

Almost surely, 2^21032374 is an apocalyptic number.

21032374 is a deficient number, since it is larger than the sum of its proper divisors (13493066).

21032374 is a wasteful number, since it uses less digits than its factorization.

21032374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3035.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 21032374 is about 4586.1066276309. The cubic root of 21032374 is about 276.0341185155.

Adding to 21032374 its reverse (47323012), we get a palindrome (68355386).

The spelling of 21032374 in words is "twenty-one million, thirty-two thousand, three hundred seventy-four".