2021220121901 has 2 divisors, whose sum is σ = 2021220121902. Its totient is φ = 2021220121900.

The previous prime is 2021220121841. The next prime is 2021220121909. The reversal of 2021220121901 is 1091210221202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1648589232676 + 372630889225 = 1283974^2 + 610435^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021220121901 - 2¹⁰ = 2021220120877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021220121909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010610060950 + 1010610060951.

It is an arithmetic number, because the mean of its divisors is an integer number (1010610060951).

Almost surely, 2^{2021220121901} is an apocalyptic number.

It is an amenable number.

2021220121901 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021220121901 is an equidigital number, since it uses as much as digits as its factorization.

2021220121901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 2021220121901 in words is "two trillion, twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, nine hundred one".