21012222001001 has 24 divisors (see below), whose sum is σ = 26395871174400. Its totient is φ = 16372941266880.

The previous prime is 21012222000949. The next prime is 21012222001013. The reversal of 21012222001001 is 10010022221012.

It is not a de Polignac number, because 21012222001001 - 2²⁶ = 21012154892137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21012222501001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96633200 + ... + 96850398.

It is an arithmetic number, because the mean of its divisors is an integer number (1099827965600).

Almost surely, 2^{21012222001001} is an apocalyptic number.

It is an amenable number.

21012222001001 is a deficient number, since it is larger than the sum of its proper divisors (5383649173399).

21012222001001 is a wasteful number, since it uses less digits than its factorization.

21012222001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331445 (or 331434 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21012222001001 its reverse (10010022221012), we get a palindrome (31022244222013).

The spelling of 21012222001001 in words is "twenty-one trillion, twelve billion, two hundred twenty-two million, one thousand, one".