20102212202221 has 4 divisors (see below), whose sum is σ = 20102232153600. Its totient is φ = 20102192250844.

The previous prime is 20102212202207. The next prime is 20102212202287. The reversal of 20102212202221 is 12220221220102.

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 20102212202221 - 2¹¹ = 20102212200173 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 (20102212002221) 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, 8379181 + ... + 10507858.

It is an arithmetic number, because the mean of its divisors is an integer number (5025558038400).

Almost surely, 2^{20102212202221} is an apocalyptic number.

It is an amenable number.

20102212202221 is a deficient number, since it is larger than the sum of its proper divisors (19951379).

20102212202221 is a wasteful number, since it uses less digits than its factorization.

20102212202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19951378.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20102212202221 its reverse (12220221220102), we get a palindrome (32322433422323).

The spelling of 20102212202221 in words is "twenty trillion, one hundred two billion, two hundred twelve million, two hundred two thousand, two hundred twenty-one".