21211121202 has 64 divisors (see below), whose sum is σ = 44621051904. Its totient is φ = 6714489600.

The previous prime is 21211121189. The next prime is 21211121207. The reversal of 21211121202 is 20212111212.

It is not an unprimeable number, because it can be changed into a prime (21211121207) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2313327 + ... + 2322477.

It is an arithmetic number, because the mean of its divisors is an integer number (697203936).

Almost surely, 2^21211121202 is an apocalyptic number.

21211121202 is an abundant number, since it is smaller than the sum of its proper divisors (23409930702).

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

21211121202 is a wasteful number, since it uses less digits than its factorization.

21211121202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9443.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21211121202 its reverse (20212111212), we get a palindrome (41423232414).

The spelling of 21211121202 in words is "twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, two hundred two".