20102120221 has 8 divisors (see below), whose sum is σ = 21652775424. Its totient is φ = 18607852560.

The previous prime is 20102120209. The next prime is 20102120243. The reversal of 20102120221 is 12202120102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20102120221 - 2¹⁹ = 20101595933 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 (20102120201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14096146 + ... + 14097571.

It is an arithmetic number, because the mean of its divisors is an integer number (2706596928).

Almost surely, 2^20102120221 is an apocalyptic number.

It is an amenable number.

20102120221 is a deficient number, since it is larger than the sum of its proper divisors (1550655203).

20102120221 is a wasteful number, since it uses less digits than its factorization.

20102120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28193771.

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

Adding to 20102120221 its reverse (12202120102), we get a palindrome (32304240323).

The spelling of 20102120221 in words is "twenty billion, one hundred two million, one hundred twenty thousand, two hundred twenty-one".