21962678 has 4 divisors (see below), whose sum is σ = 32944020. Its totient is φ = 10981338.

The previous prime is 21962659. The next prime is 21962683. The reversal of 21962678 is 87626912.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5490668 + ... + 5490671.

It is an arithmetic number, because the mean of its divisors is an integer number (8236005).

Almost surely, 2^21962678 is an apocalyptic number.

21962678 is a deficient number, since it is larger than the sum of its proper divisors (10981342).

21962678 is a wasteful number, since it uses less digits than its factorization.

21962678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10981341.

The product of its digits is 72576, while the sum is 41.

The square root of 21962678 is about 4686.4355324703. The cubic root of 21962678 is about 280.0453923007.

The spelling of 21962678 in words is "twenty-one million, nine hundred sixty-two thousand, six hundred seventy-eight".