21211001101210 has 32 divisors (see below), whose sum is σ = 40428193649040. Its totient is φ = 7984820093952.

The previous prime is 21211001101207. The next prime is 21211001101223. The reversal of 21211001101210 is 1210110011212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 11729645470449 + 9481355630761 = 3424857^2 + 3079181^2 .

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1150609 + ... + 6614068.

Almost surely, 2^{21211001101210} is an apocalyptic number.

21211001101210 is a deficient number, since it is larger than the sum of its proper divisors (19217192547830).

21211001101210 is a wasteful number, since it uses less digits than its factorization.

21211001101210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7780770.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21211001101210 its reverse (1210110011212), we get a palindrome (22421111112422).

The spelling of 21211001101210 in words is "twenty-one trillion, two hundred eleven billion, one million, one hundred one thousand, two hundred ten".