21031212202210 has 128 divisors (see below), whose sum is σ = 44990950003200. Its totient is φ = 7072946479872.

The previous prime is 21031212202109. The next prime is 21031212202219. The reversal of 21031212202210 is 1220221213012.

It is not an unprimeable number, because it can be changed into a prime (21031212202219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 922936437 + ... + 922959223.

It is an arithmetic number, because the mean of its divisors is an integer number (351491796900).

Almost surely, 2^{21031212202210} is an apocalyptic number.

21031212202210 is an abundant number, since it is smaller than the sum of its proper divisors (23959737800990).

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

21031212202210 is a wasteful number, since it uses less digits than its factorization.

21031212202210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27945 (or 27931 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21031212202210 its reverse (1220221213012), we get a palindrome (22251433415222).

The spelling of 21031212202210 in words is "twenty-one trillion, thirty-one billion, two hundred twelve million, two hundred two thousand, two hundred ten".