21000012221011 has 8 divisors (see below), whose sum is σ = 21017675551664. Its totient is φ = 20982356225280.

The previous prime is 21000012221009. The next prime is 21000012221017. The reversal of 21000012221011 is 11012221000012.

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

It is a cyclic number.

It is not a de Polignac number, because 21000012221011 - 2¹ = 21000012221009 is a prime.

It is a super-2 number, since 2×21000012221011² (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 = 21000012220982 and 21000012221000.

It is not an unprimeable number, because it can be changed into a prime (21000012221017) 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, 3902251 + ... + 7564891.

It is an arithmetic number, because the mean of its divisors is an integer number (2627209443958).

Almost surely, 2^{21000012221011} is an apocalyptic number.

21000012221011 is a deficient number, since it is larger than the sum of its proper divisors (17663330653).

21000012221011 is a wasteful number, since it uses less digits than its factorization.

21000012221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3667461.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21000012221011 its reverse (11012221000012), we get a palindrome (32012233221023).

The spelling of 21000012221011 in words is "twenty-one trillion, twelve million, two hundred twenty-one thousand, eleven".