21011000101121 has 16 divisors (see below), whose sum is σ = 22525079076864. Its totient is φ = 19552088599824.

The previous prime is 21011000101087. The next prime is 21011000101127. The reversal of 21011000101121 is 12110100011012.

It is a de Polignac number, because none of the positive numbers 2^k-21011000101121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011000101127) 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, 58012985 + ... + 58374038.

It is an arithmetic number, because the mean of its divisors is an integer number (1407817442304).

Almost surely, 2^{21011000101121} is an apocalyptic number.

It is an amenable number.

21011000101121 is a deficient number, since it is larger than the sum of its proper divisors (1514078975743).

21011000101121 is a wasteful number, since it uses less digits than its factorization.

21011000101121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116387260.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21011000101121 its reverse (12110100011012), we get a palindrome (33121100112133).

The spelling of 21011000101121 in words is "twenty-one trillion, eleven billion, one hundred one thousand, one hundred twenty-one".