21002012011001 has 32 divisors (see below), whose sum is σ = 24672825753600. Its totient is φ = 17504088408576.

The previous prime is 21002012010997. The next prime is 21002012011037. The reversal of 21002012011001 is 10011021020012.

It is not a de Polignac number, because 21002012011001 - 2² = 21002012010997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21002012011801) 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, 43823660 + ... + 44300306.

It is an arithmetic number, because the mean of its divisors is an integer number (771025804800).

Almost surely, 2^{21002012011001} is an apocalyptic number.

It is an amenable number.

21002012011001 is a deficient number, since it is larger than the sum of its proper divisors (3670813742599).

21002012011001 is a wasteful number, since it uses less digits than its factorization.

21002012011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477573.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21002012011001 its reverse (10011021020012), we get a palindrome (31013033031013).

The spelling of 21002012011001 in words is "twenty-one trillion, two billion, twelve million, eleven thousand, one".