21321102 has 32 divisors (see below), whose sum is σ = 47781504. Its totient is φ = 6285600.

The previous prime is 21321101. The next prime is 21321121. The reversal of 21321102 is 20112312.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321101) 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, 1924 + ... + 6807.

It is an arithmetic number, because the mean of its divisors is an integer number (1493172).

Almost surely, 2^21321102 is an apocalyptic number.

21321102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21321102 is an abundant number, since it is smaller than the sum of its proper divisors (26460402).

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

21321102 is a wasteful number, since it uses less digits than its factorization.

21321102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8784.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21321102 is about 4617.4778830006. The cubic root of 21321102 is about 277.2914950267.

Adding to 21321102 its reverse (20112312), we get a palindrome (41433414).

It can be divided in two parts, 21 and 321102, that added together give a palindrome (321123).

The spelling of 21321102 in words is "twenty-one million, three hundred twenty-one thousand, one hundred two".