21481662 has 16 divisors (see below), whose sum is σ = 43020432. Its totient is φ = 7151040.

The previous prime is 21481661. The next prime is 21481673. The reversal of 21481662 is 26618412.

It is a super-2 number, since 2×21481662² = 922923604564488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21481661) 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, 3712 + ... + 7532.

It is an arithmetic number, because the mean of its divisors is an integer number (2688777).

Almost surely, 2^21481662 is an apocalyptic number.

21481662 is an abundant number, since it is smaller than the sum of its proper divisors (21538770).

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

21481662 is a wasteful number, since it uses less digits than its factorization.

21481662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4763.

The product of its digits is 4608, while the sum is 30.

The square root of 21481662 is about 4634.8313885189. The cubic root of 21481662 is about 277.9858091888.

The spelling of 21481662 in words is "twenty-one million, four hundred eighty-one thousand, six hundred sixty-two".