21001120101001 has 8 divisors (see below), whose sum is σ = 22139886161600. Its totient is φ = 19865698435440.

The previous prime is 21001120100977. The next prime is 21001120101007. The reversal of 21001120101001 is 10010102110012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21001120101001 - 2³⁵ = 20966760362633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001120101007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 836085861 + ... + 836110978.

It is an arithmetic number, because the mean of its divisors is an integer number (2767485770200).

Almost surely, 2^{21001120101001} is an apocalyptic number.

It is an amenable number.

21001120101001 is a deficient number, since it is larger than the sum of its proper divisors (1138766060599).

21001120101001 is a wasteful number, since it uses less digits than its factorization.

21001120101001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672197519.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21001120101001 its reverse (10010102110012), we get a palindrome (31011222211013).

The spelling of 21001120101001 in words is "twenty-one trillion, one billion, one hundred twenty million, one hundred one thousand, one".