21202102212 has 24 divisors (see below), whose sum is σ = 49803600000. Its totient is φ = 7019934816.

The previous prime is 21202102189. The next prime is 21202102219. The reversal of 21202102212 is 21220120212.

It is a junction number, because it is equal to n+sod(n) for n = 21202102191 and 21202102200.

It is not an unprimeable number, because it can be changed into a prime (21202102219) 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, 5927212 + ... + 5930787.

It is an arithmetic number, because the mean of its divisors is an integer number (2075150000).

Almost surely, 2^21202102212 is an apocalyptic number.

It is an amenable number.

21202102212 is an abundant number, since it is smaller than the sum of its proper divisors (28601497788).

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

21202102212 is a wasteful number, since it uses less digits than its factorization.

21202102212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11858155 (or 11858153 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21202102212 its reverse (21220120212), we get a palindrome (42422222424).

The spelling of 21202102212 in words is "twenty-one billion, two hundred two million, one hundred two thousand, two hundred twelve".