2121010001021 has 4 divisors (see below), whose sum is σ = 2141602331232. Its totient is φ = 2100417670812.

The previous prime is 2121010000999. The next prime is 2121010001027. The reversal of 2121010001021 is 1201000101212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121010001021 is a prime.

It is a super-2 number, since 2×2121010001021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2121010000993 and 2121010001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121010001027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10296164951 + ... + 10296165156.

It is an arithmetic number, because the mean of its divisors is an integer number (535400582808).

Almost surely, 2^{2121010001021} is an apocalyptic number.

It is an amenable number.

2121010001021 is a deficient number, since it is larger than the sum of its proper divisors (20592330211).

2121010001021 is a wasteful number, since it uses less digits than its factorization.

2121010001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20592330210.

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

Adding to 2121010001021 its reverse (1201000101212), we get a palindrome (3322010102233).

The spelling of 2121010001021 in words is "two trillion, one hundred twenty-one billion, ten million, one thousand, twenty-one".