21000010212001 has 32 divisors (see below), whose sum is σ = 22445947130400. Its totient is φ = 19578137542656.

The previous prime is 21000010211993. The next prime is 21000010212047. The reversal of 21000010212001 is 10021201000012.

It can be written as a sum of positive squares in 16 ways, for example, as 5364787072401 + 15635223139600 = 2316201^2 + 3954140^2 .

It is not a de Polignac number, because 21000010212001 - 2³ = 21000010211993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21000010512001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4381389261 + ... + 4381394053.

It is an arithmetic number, because the mean of its divisors is an integer number (701435847825).

Almost surely, 2^{21000010212001} is an apocalyptic number.

It is an amenable number.

21000010212001 is a deficient number, since it is larger than the sum of its proper divisors (1445936918399).

21000010212001 is a wasteful number, since it uses less digits than its factorization.

21000010212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8613.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21000010212001 its reverse (10021201000012), we get a palindrome (31021211212013).

The spelling of 21000010212001 in words is "twenty-one trillion, ten million, two hundred twelve thousand, one".