2021001311221 has 4 divisors (see below), whose sum is σ = 2108870933472. Its totient is φ = 1933131688972.

The previous prime is 2021001311209. The next prime is 2021001311233. The reversal of 2021001311221 is 1221131001202.

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 an interprime number because it is at equal distance from previous prime (2021001311209) and next prime (2021001311233).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021001311221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021001311195 and 2021001311204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021001312221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43934811091 + ... + 43934811136.

It is an arithmetic number, because the mean of its divisors is an integer number (527217733368).

Almost surely, 2^{2021001311221} is an apocalyptic number.

It is an amenable number.

2021001311221 is a deficient number, since it is larger than the sum of its proper divisors (87869622251).

2021001311221 is an equidigital number, since it uses as much as digits as its factorization.

2021001311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87869622250.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 2021001311221 its reverse (1221131001202), we get a palindrome (3242132312423).

The spelling of 2021001311221 in words is "two trillion, twenty-one billion, one million, three hundred eleven thousand, two hundred twenty-one".