21321002102 has 16 divisors (see below), whose sum is σ = 32129809920. Its totient is φ = 10611175848.

The previous prime is 21321002099. The next prime is 21321002107. The reversal of 21321002102 is 20120012312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321002107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365603 + ... + 419889.

It is an arithmetic number, because the mean of its divisors is an integer number (2008113120).

Almost surely, 2^21321002102 is an apocalyptic number.

21321002102 is a deficient number, since it is larger than the sum of its proper divisors (10808807818).

21321002102 is a wasteful number, since it uses less digits than its factorization.

21321002102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55195.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21321002102 its reverse (20120012312), we get a palindrome (41441014414).

The spelling of 21321002102 in words is "twenty-one billion, three hundred twenty-one million, two thousand, one hundred two".