20021212222211 has 4 divisors (see below), whose sum is σ = 20246169663000. Its totient is φ = 19796254781424.

The previous prime is 20021212222069. The next prime is 20021212222217. The reversal of 20021212222211 is 11222221212002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20021212222211 - 2³⁰ = 20020138480387 is a prime.

It is a super-2 number, since 2×20021212222211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021212222217) 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, 112478720261 + ... + 112478720438.

It is an arithmetic number, because the mean of its divisors is an integer number (5061542415750).

Almost surely, 2^{20021212222211} is an apocalyptic number.

20021212222211 is a deficient number, since it is larger than the sum of its proper divisors (224957440789).

20021212222211 is an equidigital number, since it uses as much as digits as its factorization.

20021212222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224957440788.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 20021212222211 its reverse (11222221212002), we get a palindrome (31243433434213).

The spelling of 20021212222211 in words is "twenty trillion, twenty-one billion, two hundred twelve million, two hundred twenty-two thousand, two hundred eleven".