2102020001221 has 16 divisors (see below), whose sum is σ = 2422621152000. Its totient is φ = 1786558802688.

The previous prime is 2102020001219. The next prime is 2102020001261. The reversal of 2102020001221 is 1221000202012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2102020001221 - 2¹ = 2102020001219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102020001261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2166916 + ... + 2983213.

It is an arithmetic number, because the mean of its divisors is an integer number (151413822000).

Almost surely, 2^{2102020001221} is an apocalyptic number.

It is an amenable number.

2102020001221 is a deficient number, since it is larger than the sum of its proper divisors (320601150779).

2102020001221 is a wasteful number, since it uses less digits than its factorization.

2102020001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5150628.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2102020001221 its reverse (1221000202012), we get a palindrome (3323020203233).

The spelling of 2102020001221 in words is "two trillion, one hundred two billion, twenty million, one thousand, two hundred twenty-one".