2102201222021 has 16 divisors (see below), whose sum is σ = 2237338422000. Its totient is φ = 1968341007360.

The previous prime is 2102201221943. The next prime is 2102201222041. The reversal of 2102201222021 is 1202221022012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 803766040900 + 1298435181121 = 896530^2 + 1139489^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102201222021 - 2³⁴ = 2085021352837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102201222041) 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, 75743855 + ... + 75771603.

It is an arithmetic number, because the mean of its divisors is an integer number (139833651375).

Almost surely, 2^{2102201222021} is an apocalyptic number.

It is an amenable number.

2102201222021 is a deficient number, since it is larger than the sum of its proper divisors (135137199979).

2102201222021 is a wasteful number, since it uses less digits than its factorization.

2102201222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50584.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2102201222021 its reverse (1202221022012), we get a palindrome (3304422244033).

The spelling of 2102201222021 in words is "two trillion, one hundred two billion, two hundred one million, two hundred twenty-two thousand, twenty-one".