21201102 has 40 divisors (see below), whose sum is σ = 51165576. Its totient is φ = 6522768.

The previous prime is 21201083. The next prime is 21201109. The reversal of 21201102 is 20110212.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201109) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2928 + ... + 7139.

Almost surely, 2^21201102 is an apocalyptic number.

21201102 is an abundant number, since it is smaller than the sum of its proper divisors (29964474).

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

21201102 is a wasteful number, since it uses less digits than its factorization.

21201102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10094 (or 10085 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 21201102 is about 4604.4654412863. The cubic root of 21201102 is about 276.7702961738.

Adding to 21201102 its reverse (20110212), we get a palindrome (41311314).

The spelling of 21201102 in words is "twenty-one million, two hundred one thousand, one hundred two".