21121100020211 has 32 divisors (see below), whose sum is σ = 22835597030400. Its totient is φ = 19472011614720.

The previous prime is 21121100020183. The next prime is 21121100020291. The reversal of 21121100020211 is 11202000112112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121100020211 is a prime.

It is a super-2 number, since 2×21121100020211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121100020291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138305645 + ... + 138458273.

It is an arithmetic number, because the mean of its divisors is an integer number (713612407200).

Almost surely, 2^{21121100020211} is an apocalyptic number.

21121100020211 is a deficient number, since it is larger than the sum of its proper divisors (1714497010189).

21121100020211 is a wasteful number, since it uses less digits than its factorization.

21121100020211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153579.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21121100020211 its reverse (11202000112112), we get a palindrome (32323100132323).

The spelling of 21121100020211 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred million, twenty thousand, two hundred eleven".