2121001201021 has 16 divisors (see below), whose sum is σ = 2310462000000. Its totient is φ = 1939373827776.

The previous prime is 2121001201013. The next prime is 2121001201037. The reversal of 2121001201021 is 1201021001212.

It is a cyclic number.

It is not a de Polignac number, because 2121001201021 - 2³ = 2121001201013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121001200992 and 2121001201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121001201421) 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, 814560 + ... + 2214838.

It is an arithmetic number, because the mean of its divisors is an integer number (144403875000).

Almost surely, 2^{2121001201021} is an apocalyptic number.

It is an amenable number.

2121001201021 is a deficient number, since it is larger than the sum of its proper divisors (189460798979).

2121001201021 is a wasteful number, since it uses less digits than its factorization.

2121001201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1403076.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2121001201021 its reverse (1201021001212), we get a palindrome (3322022202233).

The spelling of 2121001201021 in words is "two trillion, one hundred twenty-one billion, one million, two hundred one thousand, twenty-one".