2001101210021 has 16 divisors (see below), whose sum is σ = 2016962787840. Its totient is φ = 1985306146560.

The previous prime is 2001101209993. The next prime is 2001101210027. The reversal of 2001101210021 is 1200121011002.

It is a cyclic number.

It is not a de Polignac number, because 2001101210021 - 2¹⁸ = 2001100947877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001101209984 and 2001101210011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001101210027) 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, 278197601 + ... + 278204793.

It is an arithmetic number, because the mean of its divisors is an integer number (126060174240).

Almost surely, 2^{2001101210021} is an apocalyptic number.

It is an amenable number.

2001101210021 is a deficient number, since it is larger than the sum of its proper divisors (15861577819).

2001101210021 is a wasteful number, since it uses less digits than its factorization.

2001101210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11516.

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

Adding to 2001101210021 its reverse (1200121011002), we get a palindrome (3201222221023).

It can be divided in two parts, 2001101 and 210021, that added together give a palindrome (2211122).

The spelling of 2001101210021 in words is "two trillion, one billion, one hundred one million, two hundred ten thousand, twenty-one".