21212010202210 has 16 divisors (see below), whose sum is σ = 40191177225600. Its totient is φ = 8038235444976.

The previous prime is 21212010202171. The next prime is 21212010202211. The reversal of 21212010202210 is 1220201021212.

It is a happy number.

It is a super-2 number, since 2×21212010202210² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212010202211) 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, 55821079290 + ... + 55821079669.

It is an arithmetic number, because the mean of its divisors is an integer number (2511948576600).

Almost surely, 2^{21212010202210} is an apocalyptic number.

21212010202210 is a deficient number, since it is larger than the sum of its proper divisors (18979167023390).

21212010202210 is a wasteful number, since it uses less digits than its factorization.

21212010202210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111642158985.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212010202210 its reverse (1220201021212), we get a palindrome (22432211223422).

The spelling of 21212010202210 in words is "twenty-one trillion, two hundred twelve billion, ten million, two hundred two thousand, two hundred ten".