21011210202 has 16 divisors (see below), whose sum is σ = 43158161952. Its totient is φ = 6814446480.

The previous prime is 21011210201. The next prime is 21011210221. The reversal of 21011210202 is 20201211012.

It is not an unprimeable number, because it can be changed into a prime (21011210201) 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, 47322324 + ... + 47322767.

It is an arithmetic number, because the mean of its divisors is an integer number (2697385122).

Almost surely, 2^21011210202 is an apocalyptic number.

21011210202 is an abundant number, since it is smaller than the sum of its proper divisors (22146951750).

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

21011210202 is a wasteful number, since it uses less digits than its factorization.

21011210202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94645133.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21011210202 its reverse (20201211012), we get a palindrome (41212421214).

The spelling of 21011210202 in words is "twenty-one billion, eleven million, two hundred ten thousand, two hundred two".