20210102221 has 4 divisors (see below), whose sum is σ = 20323008000. Its totient is φ = 20097196444.

The previous prime is 20210102207. The next prime is 20210102249. The reversal of 20210102221 is 12220101202.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12220101202 = 2 ⋅6110050601.

It is a cyclic number.

It is not a de Polignac number, because 20210102221 - 2¹⁷ = 20209971149 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 (20210102281) 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, 56452621 + ... + 56452978.

It is an arithmetic number, because the mean of its divisors is an integer number (5080752000).

Almost surely, 2^20210102221 is an apocalyptic number.

It is an amenable number.

20210102221 is a deficient number, since it is larger than the sum of its proper divisors (112905779).

20210102221 is a wasteful number, since it uses less digits than its factorization.

20210102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112905778.

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

Adding to 20210102221 its reverse (12220101202), we get a palindrome (32430203423).

The spelling of 20210102221 in words is "twenty billion, two hundred ten million, one hundred two thousand, two hundred twenty-one".