211221211201210 has 128 divisors (see below), whose sum is σ = 452838851942400. Its totient is φ = 70873896038400.

The previous prime is 211221211201043. The next prime is 211221211201219. The reversal of 211221211201210 is 12102112122112.

It is a happy number.

It is a super-2 number, since 2×211221211201210² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221211201219) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4862233090 + ... + 4862276530.

It is an arithmetic number, because the mean of its divisors is an integer number (3537803530800).

Almost surely, 2^{211221211201210} is an apocalyptic number.

211221211201210 is an abundant number, since it is smaller than the sum of its proper divisors (241617640741190).

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

211221211201210 is a wasteful number, since it uses less digits than its factorization.

211221211201210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73677 (or 73663 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211221211201210 its reverse (12102112122112), we get a palindrome (223323323323322).

The spelling of 211221211201210 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, two hundred one thousand, two hundred ten".