21677948 has 12 divisors (see below), whose sum is σ = 38328192. Its totient is φ = 10727040.

The previous prime is 21677947. The next prime is 21677963. The reversal of 21677948 is 84977612.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21677899 and 21677908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21677947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27548 + ... + 28323.

It is an arithmetic number, because the mean of its divisors is an integer number (3194016).

Almost surely, 2^21677948 is an apocalyptic number.

It is an amenable number.

21677948 is a deficient number, since it is larger than the sum of its proper divisors (16650244).

21677948 is a wasteful number, since it uses less digits than its factorization.

21677948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55972 (or 55970 counting only the distinct ones).

The product of its digits is 169344, while the sum is 44.

The square root of 21677948 is about 4655.9583331469. The cubic root of 21677948 is about 278.8299302243.

The spelling of 21677948 in words is "twenty-one million, six hundred seventy-seven thousand, nine hundred forty-eight".