21851082 has 24 divisors (see below), whose sum is σ = 51648480. Its totient is φ = 6621480.

The previous prime is 21851077. The next prime is 21851087. The reversal of 21851082 is 28015812.

It is an interprime number because it is at equal distance from previous prime (21851077) and next prime (21851087).

It is not an unprimeable number, because it can be changed into a prime (21851087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54982 + ... + 55377.

It is an arithmetic number, because the mean of its divisors is an integer number (2152020).

Almost surely, 2^21851082 is an apocalyptic number.

21851082 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21851082 is an abundant number, since it is smaller than the sum of its proper divisors (29797398).

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

21851082 is a wasteful number, since it uses less digits than its factorization.

21851082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110378 (or 110375 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 21851082 is about 4674.5140923951. The cubic root of 21851082 is about 279.5702676729.

Adding to 21851082 its reverse (28015812), we get a palindrome (49866894).

The spelling of 21851082 in words is "twenty-one million, eight hundred fifty-one thousand, eighty-two".