2021205252221 has 16 divisors (see below), whose sum is σ = 2110614257664. Its totient is φ = 1931924429424.

The previous prime is 2021205252203. The next prime is 2021205252293. The reversal of 2021205252221 is 1222525021202.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021205252221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021205252821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258363116 + ... + 258370938.

It is an arithmetic number, because the mean of its divisors is an integer number (131913391104).

Almost surely, 2^{2021205252221} is an apocalyptic number.

It is an amenable number.

2021205252221 is a deficient number, since it is larger than the sum of its proper divisors (89409005443).

2021205252221 is a wasteful number, since it uses less digits than its factorization.

2021205252221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14560.

The product of its (nonzero) digits is 3200, while the sum is 26.

The spelling of 2021205252221 in words is "two trillion, twenty-one billion, two hundred five million, two hundred fifty-two thousand, two hundred twenty-one".