21122001011021 has 8 divisors (see below), whose sum is σ = 21867297305400. Its totient is φ = 20377834812160.

The previous prime is 21122001010909. The next prime is 21122001011051. The reversal of 21122001011021 is 12011010022112.

It can be written as a sum of positive squares in 4 ways, for example, as 7689695380900 + 13432305630121 = 2773030^2 + 3665011^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21122001011021 is a prime.

It is a super-2 number, since 2×21122001011021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21122001010987 and 21122001011005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122001011051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282485840 + ... + 282560601.

It is an arithmetic number, because the mean of its divisors is an integer number (2733412163175).

Almost surely, 2^{21122001011021} is an apocalyptic number.

It is an amenable number.

21122001011021 is a deficient number, since it is larger than the sum of its proper divisors (745296294379).

21122001011021 is a wasteful number, since it uses less digits than its factorization.

21122001011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565047759.

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

Adding to 21122001011021 its reverse (12011010022112), we get a palindrome (33133011033133).

The spelling of 21122001011021 in words is "twenty-one trillion, one hundred twenty-two billion, one million, eleven thousand, twenty-one".