21213202102 has 8 divisors (see below), whose sum is σ = 32846248512. Its totient is φ = 10264452600.

The previous prime is 21213202091. The next prime is 21213202103. The reversal of 21213202102 is 20120231212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213202103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171074149 + ... + 171074272.

It is an arithmetic number, because the mean of its divisors is an integer number (4105781064).

Almost surely, 2^21213202102 is an apocalyptic number.

21213202102 is a deficient number, since it is larger than the sum of its proper divisors (11633046410).

21213202102 is a wasteful number, since it uses less digits than its factorization.

21213202102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342148454.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21213202102 its reverse (20120231212), we get a palindrome (41333433314).

The spelling of 21213202102 in words is "twenty-one billion, two hundred thirteen million, two hundred two thousand, one hundred two".