21471102 has 64 divisors (see below), whose sum is σ = 53222400. Its totient is φ = 6376320.

The previous prime is 21471097. The next prime is 21471133. The reversal of 21471102 is 20117412.

It is a super-2 number, since 2×21471102² = 922016442188808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16827 + ... + 18057.

It is an arithmetic number, because the mean of its divisors is an integer number (831600).

Almost surely, 2^21471102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21471102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26611200).

21471102 is an abundant number, since it is smaller than the sum of its proper divisors (31751298).

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

21471102 is a wasteful number, since it uses less digits than its factorization.

21471102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278 (or 1272 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 21471102 is about 4633.6920484642. The cubic root of 21471102 is about 277.9402507757.

Adding to 21471102 its reverse (20117412), we get a palindrome (41588514).

It can be divided in two parts, 2147 and 1102, that added together give a square (3249 = 57²).

The spelling of 21471102 in words is "twenty-one million, four hundred seventy-one thousand, one hundred two".