21001101121 has 16 divisors (see below), whose sum is σ = 28197283968. Its totient is φ = 15105686400.

The previous prime is 21001101101. The next prime is 21001101137. The reversal of 21001101121 is 12110110012.

It is not a de Polignac number, because 21001101121 - 2⁵ = 21001101089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21001101098 and 21001101107.

It is not an unprimeable number, because it can be changed into a prime (21001101101) 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, 10489060 + ... + 10491061.

It is an arithmetic number, because the mean of its divisors is an integer number (1762330248).

Almost surely, 2^21001101121 is an apocalyptic number.

It is an amenable number.

21001101121 is a deficient number, since it is larger than the sum of its proper divisors (7196182847).

21001101121 is a wasteful number, since it uses less digits than its factorization.

21001101121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20980152.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21001101121 its reverse (12110110012), we get a palindrome (33111211133).

The spelling of 21001101121 in words is "twenty-one billion, one million, one hundred one thousand, one hundred twenty-one".