21948468 has 24 divisors (see below), whose sum is σ = 51791040. Its totient is φ = 7233600.

The previous prime is 21948461. The next prime is 21948469. The reversal of 21948468 is 86484912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21948461) 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, 9208 + ... + 11343.

It is an arithmetic number, because the mean of its divisors is an integer number (2157960).

Almost surely, 2^21948468 is an apocalyptic number.

It is an amenable number.

21948468 is an abundant number, since it is smaller than the sum of its proper divisors (29842572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21948468 is a wasteful number, since it uses less digits than its factorization.

21948468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20647 (or 20645 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 21948468 is about 4684.9192095489. The cubic root of 21948468 is about 279.9849821877.

The spelling of 21948468 in words is "twenty-one million, nine hundred forty-eight thousand, four hundred sixty-eight".