21121002101211 has 64 divisors (see below), whose sum is σ = 29493667991040. Its totient is φ = 13433669544960.

The previous prime is 21121002101189. The next prime is 21121002101263. The reversal of 21121002101211 is 11210120012112.

It is a happy number.

It is not a de Polignac number, because 21121002101211 - 2²² = 21120997906907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21121002101291) 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, 2813503920 + ... + 2813511426.

It is an arithmetic number, because the mean of its divisors is an integer number (460838562360).

Almost surely, 2^{21121002101211} is an apocalyptic number.

21121002101211 is a deficient number, since it is larger than the sum of its proper divisors (8372665889829).

21121002101211 is a wasteful number, since it uses less digits than its factorization.

21121002101211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10476.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21121002101211 its reverse (11210120012112), we get a palindrome (32331122113323).

The spelling of 21121002101211 in words is "twenty-one trillion, one hundred twenty-one billion, two million, one hundred one thousand, two hundred eleven".