21371466 has 16 divisors (see below), whose sum is σ = 44992800. Its totient is φ = 6748848.

The previous prime is 21371461. The next prime is 21371479. The reversal of 21371466 is 66417312.

It is a super-4 number, since 4×21371466⁴ (a number of 30 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (21371461) 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, 93621 + ... + 93848.

It is an arithmetic number, because the mean of its divisors is an integer number (2812050).

Almost surely, 2^21371466 is an apocalyptic number.

21371466 is an abundant number, since it is smaller than the sum of its proper divisors (23621334).

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

21371466 is a wasteful number, since it uses less digits than its factorization.

21371466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187493.

The product of its digits is 6048, while the sum is 30.

The square root of 21371466 is about 4622.9282927599. The cubic root of 21371466 is about 277.5096595940.

Adding to 21371466 its reverse (66417312), we get a palindrome (87788778).

The spelling of 21371466 in words is "twenty-one million, three hundred seventy-one thousand, four hundred sixty-six".