20212312222221 has 16 divisors (see below), whose sum is σ = 30852183581184. Its totient is φ = 11530216553904.

The previous prime is 20212312222153. The next prime is 20212312222229. The reversal of 20212312222221 is 12222221321202.

It is not a de Polignac number, because 20212312222221 - 2¹⁷ = 20212312091149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20212312222191 and 20212312222200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212312222229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 819826735 + ... + 819851388.

It is an arithmetic number, because the mean of its divisors is an integer number (1928261473824).

Almost surely, 2^{20212312222221} is an apocalyptic number.

20212312222221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20212312222221 is a deficient number, since it is larger than the sum of its proper divisors (10639871358963).

20212312222221 is a wasteful number, since it uses less digits than its factorization.

20212312222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639678720.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 20212312222221 its reverse (12222221321202), we get a palindrome (32434533543423).

The spelling of 20212312222221 in words is "twenty trillion, two hundred twelve billion, three hundred twelve million, two hundred twenty-two thousand, two hundred twenty-one".