21964042 has 8 divisors (see below), whose sum is σ = 32970276. Its totient is φ = 10973952.

The previous prime is 21964037. The next prime is 21964067. The reversal of 21964042 is 24046912.

It can be written as a sum of positive squares in 2 ways, for example, as 21724921 + 239121 = 4661^2 + 489^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21964042.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298 + ... + 6634.

Almost surely, 2^21964042 is an apocalyptic number.

21964042 is a deficient number, since it is larger than the sum of its proper divisors (11006234).

21964042 is a wasteful number, since it uses less digits than its factorization.

21964042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8072.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 21964042 is about 4686.5810565913. The cubic root of 21964042 is about 280.0511896205.

It can be divided in two parts, 219 and 64042, that added together give a triangular number (64261 = T₃₅₈).

The spelling of 21964042 in words is "twenty-one million, nine hundred sixty-four thousand, forty-two".