21001120112001 has 16 divisors (see below), whose sum is σ = 28476321508800. Its totient is φ = 13763336502528.

The previous prime is 21001120111949. The next prime is 21001120112017. The reversal of 21001120112001 is 10021102110012.

It is not a de Polignac number, because 21001120112001 - 2²² = 21001115917697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001120112701) 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, 26049765 + ... + 26843853.

It is an arithmetic number, because the mean of its divisors is an integer number (1779770094300).

Almost surely, 2^{21001120112001} is an apocalyptic number.

It is an amenable number.

21001120112001 is a deficient number, since it is larger than the sum of its proper divisors (7475201396799).

21001120112001 is a wasteful number, since it uses less digits than its factorization.

21001120112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943568.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21001120112001 its reverse (10021102110012), we get a palindrome (31022222222013).

The spelling of 21001120112001 in words is "twenty-one trillion, one billion, one hundred twenty million, one hundred twelve thousand, one".