21012341121 has 6 divisors (see below), whose sum is σ = 30351159410. Its totient is φ = 14008227408.

The previous prime is 21012341101. The next prime is 21012341143. The reversal of 21012341121 is 12114321012.

21012341121 is a `hidden beast` number, since 210 + 1 + 23 + 411 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14457657600 + 6554683521 = 120240^2 + 80961^2 .

It is not a de Polignac number, because 21012341121 - 2⁶ = 21012341057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012341094 and 21012341103.

It is not an unprimeable number, because it can be changed into a prime (21012341101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1167352276 + ... + 1167352293.

Almost surely, 2^21012341121 is an apocalyptic number.

It is an amenable number.

21012341121 is a deficient number, since it is larger than the sum of its proper divisors (9338818289).

21012341121 is a wasteful number, since it uses less digits than its factorization.

21012341121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334704575 (or 2334704572 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21012341121 its reverse (12114321012), we get a palindrome (33126662133).

The spelling of 21012341121 in words is "twenty-one billion, twelve million, three hundred forty-one thousand, one hundred twenty-one".