2121020111021 has 8 divisors (see below), whose sum is σ = 2424033090624. Its totient is φ = 1818009658080.

The previous prime is 2121020110991. The next prime is 2121020111033. The reversal of 2121020111021 is 1201110201212.

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

It is not a de Polignac number, because 2121020111021 - 2²² = 2121015916717 is a prime.

It is a super-2 number, since 2×2121020111021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121020110987 and 2121020111005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121020110021) 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, 1782086 + ... + 2723576.

It is an arithmetic number, because the mean of its divisors is an integer number (303004136328).

Almost surely, 2^{2121020111021} is an apocalyptic number.

It is an amenable number.

2121020111021 is a deficient number, since it is larger than the sum of its proper divisors (303012979603).

2121020111021 is an equidigital number, since it uses as much as digits as its factorization.

2121020111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263331.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2121020111021 its reverse (1201110201212), we get a palindrome (3322130312233).

The spelling of 2121020111021 in words is "two trillion, one hundred twenty-one billion, twenty million, one hundred eleven thousand, twenty-one".