21012222112001 has 16 divisors (see below), whose sum is σ = 21451563940800. Its totient is φ = 20576936571840.

The previous prime is 21012222111877. The next prime is 21012222112061. The reversal of 21012222112001 is 10021122221012.

It is a cyclic number.

It is not a de Polignac number, because 21012222112001 - 2²² = 21012217917697 is a prime.

It is a super-3 number, since 3×21012222112001³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012222112061) 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, 6382355 + ... + 9097191.

It is an arithmetic number, because the mean of its divisors is an integer number (1340722746300).

Almost surely, 2^{21012222112001} is an apocalyptic number.

It is an amenable number.

21012222112001 is a deficient number, since it is larger than the sum of its proper divisors (439341828799).

21012222112001 is a wasteful number, since it uses less digits than its factorization.

21012222112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715584.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21012222112001 its reverse (10021122221012), we get a palindrome (31033344333013).

The spelling of 21012222112001 in words is "twenty-one trillion, twelve billion, two hundred twenty-two million, one hundred twelve thousand, one".