21000011000001 has 32 divisors (see below), whose sum is σ = 30728344657920. Its totient is φ = 12651146481600.

The previous prime is 21000010999999. The next prime is 21000011000057. The reversal of 21000011000001 is 10000011000012.

It is not a de Polignac number, because 21000011000001 - 2¹ = 21000010999999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21000011000081) 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, 12208416 + ... + 13821918.

It is an arithmetic number, because the mean of its divisors is an integer number (960260770560).

Almost surely, 2^{21000011000001} is an apocalyptic number.

It is an amenable number.

21000011000001 is a deficient number, since it is larger than the sum of its proper divisors (9728333657919).

21000011000001 is a wasteful number, since it uses less digits than its factorization.

21000011000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615877.

The product of its (nonzero) digits is 2, while the sum is 6.

Adding to 21000011000001 its reverse (10000011000012), we get a palindrome (31000022000013).

The spelling of 21000011000001 in words is "twenty-one trillion, eleven million, one", and thus it is an aban number and an uban number.