21948377 has 8 divisors (see below), whose sum is σ = 25352352. Its totient is φ = 18779200.

The previous prime is 21948323. The next prime is 21948391. The reversal of 21948377 is 77384912.

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

It is not a de Polignac number, because 21948377 - 2⁶ = 21948313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21948317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58499 + ... + 58872.

It is an arithmetic number, because the mean of its divisors is an integer number (3169044).

Almost surely, 2^21948377 is an apocalyptic number.

It is an amenable number.

21948377 is a deficient number, since it is larger than the sum of its proper divisors (3403975).

21948377 is a wasteful number, since it uses less digits than its factorization.

21948377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117399.

The product of its digits is 84672, while the sum is 41.

The square root of 21948377 is about 4684.9094975250. The cubic root of 21948377 is about 279.9845952409.

The spelling of 21948377 in words is "twenty-one million, nine hundred forty-eight thousand, three hundred seventy-seven".