21121102001011 has 4 divisors (see below), whose sum is σ = 21133533493000. Its totient is φ = 21108670509024.

The previous prime is 21121102000997. The next prime is 21121102001029. The reversal of 21121102001011 is 11010020112112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21121102001011 - 2³⁷ = 20983663047539 is a prime.

It is a super-2 number, since 2×21121102001011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21121102000982 and 21121102001000.

It is not an unprimeable number, because it can be changed into a prime (21121102001411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6215743446 + ... + 6215746843.

It is an arithmetic number, because the mean of its divisors is an integer number (5283383373250).

Almost surely, 2^{21121102001011} is an apocalyptic number.

21121102001011 is a deficient number, since it is larger than the sum of its proper divisors (12431491989).

21121102001011 is a wasteful number, since it uses less digits than its factorization.

21121102001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12431491988.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21121102001011 its reverse (11010020112112), we get a palindrome (32131122113123).

The spelling of 21121102001011 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred two million, one thousand, eleven".