21354102 has 144 divisors (see below), whose sum is σ = 61461504. Its totient is φ = 5292000.

The previous prime is 21354083. The next prime is 21354103. The reversal of 21354102 is 20145312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354103) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 300727 + ... + 300797.

It is an arithmetic number, because the mean of its divisors is an integer number (426816).

Almost surely, 2^21354102 is an apocalyptic number.

21354102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21354102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30730752).

21354102 is an abundant number, since it is smaller than the sum of its proper divisors (40107402).

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

21354102 is a wasteful number, since it uses less digits than its factorization.

21354102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21354102 is about 4621.0498807089. The cubic root of 21354102 is about 277.4344817321.

Adding to 21354102 its reverse (20145312), we get a palindrome (41499414).

The spelling of 21354102 in words is "twenty-one million, three hundred fifty-four thousand, one hundred two".