20012202012221 has 4 divisors (see below), whose sum is σ = 20013107113344. Its totient is φ = 20011296911100.

The previous prime is 20012202012217. The next prime is 20012202012241. The reversal of 20012202012221 is 12221020221002.

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 20012202012221 - 2² = 20012202012217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20012202012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012202012241) 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, 452517395 + ... + 452561616.

It is an arithmetic number, because the mean of its divisors is an integer number (5003276778336).

Almost surely, 2^{20012202012221} is an apocalyptic number.

It is an amenable number.

20012202012221 is a deficient number, since it is larger than the sum of its proper divisors (905101123).

20012202012221 is an equidigital number, since it uses as much as digits as its factorization.

20012202012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905101122.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20012202012221 its reverse (12221020221002), we get a palindrome (32233222233223).

The spelling of 20012202012221 in words is "twenty trillion, twelve billion, two hundred two million, twelve thousand, two hundred twenty-one".