2121121020021 has 8 divisors (see below), whose sum is σ = 2835545594880. Its totient is φ = 1410388562592.

The previous prime is 2121121020001. The next prime is 2121121020097. The reversal of 2121121020021 is 1200201211212.

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

It is not a de Polignac number, because 2121121020021 - 2²¹ = 2121118922869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121121020001) 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, 923028016 + ... + 923030313.

It is an arithmetic number, because the mean of its divisors is an integer number (354443199360).

Almost surely, 2^{2121121020021} is an apocalyptic number.

It is an amenable number.

2121121020021 is a deficient number, since it is larger than the sum of its proper divisors (714424574859).

2121121020021 is a wasteful number, since it uses less digits than its factorization.

2121121020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846058715.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2121121020021 its reverse (1200201211212), we get a palindrome (3321322231233).

The spelling of 2121121020021 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, twenty thousand, twenty-one".