20102012221 has 8 divisors (see below), whose sum is σ = 20706082488. Its totient is φ = 19503360000.

The previous prime is 20102012209. The next prime is 20102012233. The reversal of 20102012221 is 12221020102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20102012209) and next prime (20102012233).

It can be written as a sum of positive squares in 4 ways, for example, as 3719292196 + 16382720025 = 60986^2 + 127995^2 .

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 20102012221 - 2¹⁵ = 20101979453 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 (20102012291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1346980 + ... + 1361821.

It is an arithmetic number, because the mean of its divisors is an integer number (2588260311).

Almost surely, 2^20102012221 is an apocalyptic number.

It is an amenable number.

20102012221 is a deficient number, since it is larger than the sum of its proper divisors (604070267).

20102012221 is a wasteful number, since it uses less digits than its factorization.

20102012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2709023.

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

Adding to 20102012221 its reverse (12221020102), we get a palindrome (32323032323).

The spelling of 20102012221 in words is "twenty billion, one hundred two million, twelve thousand, two hundred twenty-one".