21121010211 has 16 divisors (see below), whose sum is σ = 32625281024. Its totient is φ = 11903817024.

The previous prime is 21121010167. The next prime is 21121010221. The reversal of 21121010211 is 11201012112.

It is not a de Polignac number, because 21121010211 - 2²⁷ = 20986792483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21121010221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6887251 + ... + 6890316.

It is an arithmetic number, because the mean of its divisors is an integer number (2039080064).

Almost surely, 2^21121010211 is an apocalyptic number.

21121010211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21121010211 is a deficient number, since it is larger than the sum of its proper divisors (11504270813).

21121010211 is a wasteful number, since it uses less digits than its factorization.

21121010211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13777650.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21121010211 its reverse (11201012112), we get a palindrome (32322022323).

The spelling of 21121010211 in words is "twenty-one billion, one hundred twenty-one million, ten thousand, two hundred eleven".