102020001221 has 4 divisors (see below), whose sum is σ = 106455653472. Its totient is φ = 97584348972.

The previous prime is 102020001169. The next prime is 102020001227. The reversal of 102020001221 is 122100020201.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 102020001221 - 2³⁴ = 84840132037 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 (102020001227) 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, 2217826091 + ... + 2217826136.

It is an arithmetic number, because the mean of its divisors is an integer number (26613913368).

Almost surely, 2^102020001221 is an apocalyptic number.

It is an amenable number.

102020001221 is a deficient number, since it is larger than the sum of its proper divisors (4435652251).

102020001221 is an equidigital number, since it uses as much as digits as its factorization.

102020001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4435652250.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 102020001221 its reverse (122100020201), we get a palindrome (224120021422).

The spelling of 102020001221 in words is "one hundred two billion, twenty million, one thousand, two hundred twenty-one".