211221210001210 has 8 divisors (see below), whose sum is σ = 380198178002196. Its totient is φ = 84488484000480.

The previous prime is 211221210001091. The next prime is 211221210001211. The reversal of 211221210001210 is 12100012122112.

It can be written as a sum of positive squares in 2 ways, for example, as 205284448718001 + 5936761283209 = 14327751^2 + 2436547^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×211221210001210² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221210001211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10561060500051 + ... + 10561060500070.

Almost surely, 2^{211221210001210} is an apocalyptic number.

211221210001210 is a deficient number, since it is larger than the sum of its proper divisors (168976968000986).

211221210001210 is a wasteful number, since it uses less digits than its factorization.

211221210001210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21122121000128.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211221210001210 its reverse (12100012122112), we get a palindrome (223321222123322).

The spelling of 211221210001210 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred ten million, one thousand, two hundred ten".