21831414 has 32 divisors (see below), whose sum is σ = 48352896. Its totient is φ = 6515520.

The previous prime is 21831373. The next prime is 21831419. The reversal of 21831414 is 41413812.

It is a super-2 number, since 2×21831414² = 953221274478792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21831419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1954 + ... + 6890.

It is an arithmetic number, because the mean of its divisors is an integer number (1511028).

Almost surely, 2^21831414 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21831414, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24176448).

21831414 is an abundant number, since it is smaller than the sum of its proper divisors (26521482).

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

21831414 is a wasteful number, since it uses less digits than its factorization.

21831414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5020.

The product of its digits is 768, while the sum is 24.

The square root of 21831414 is about 4672.4098707198. The cubic root of 21831414 is about 279.4863627722.

The spelling of 21831414 in words is "twenty-one million, eight hundred thirty-one thousand, four hundred fourteen".