21121010121211 has 64 divisors (see below), whose sum is σ = 28790502322176. Its totient is φ = 14960528668800.

The previous prime is 21121010121143. The next prime is 21121010121251. The reversal of 21121010121211 is 11212101012112.

It is not a de Polignac number, because 21121010121211 - 2⁷ = 21121010121083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21121010121251) 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, 222816256 + ... + 222911026.

It is an arithmetic number, because the mean of its divisors is an integer number (449851598784).

Almost surely, 2^{21121010121211} is an apocalyptic number.

21121010121211 is a deficient number, since it is larger than the sum of its proper divisors (7669492200965).

21121010121211 is a wasteful number, since it uses less digits than its factorization.

21121010121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98192.

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

Adding to 21121010121211 its reverse (11212101012112), we get a palindrome (32333111133323).

The spelling of 21121010121211 in words is "twenty-one trillion, one hundred twenty-one billion, ten million, one hundred twenty-one thousand, two hundred eleven".