21869938 has 4 divisors (see below), whose sum is σ = 32804910. Its totient is φ = 10934968.

The previous prime is 21869879. The next prime is 21869951. The reversal of 21869938 is 83996812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17447329 + 4422609 = 4177^2 + 2103^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5467483 + ... + 5467486.

Almost surely, 2^21869938 is an apocalyptic number.

21869938 is a deficient number, since it is larger than the sum of its proper divisors (10934972).

21869938 is a wasteful number, since it uses less digits than its factorization.

21869938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10934971.

The product of its digits is 186624, while the sum is 46.

The square root of 21869938 is about 4676.5305515948. The cubic root of 21869938 is about 279.6506612717.

The spelling of 21869938 in words is "twenty-one million, eight hundred sixty-nine thousand, nine hundred thirty-eight".