20212211211221 has 8 divisors (see below), whose sum is σ = 20301811004160. Its totient is φ = 20122616324128.

The previous prime is 20212211211187. The next prime is 20212211211259. The reversal of 20212211211221 is 12211211221202.

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 20212211211221 - 2²⁶ = 20212144102357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212211211193 and 20212211211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212211213221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7158620 + ... + 9574458.

It is an arithmetic number, because the mean of its divisors is an integer number (2537726375520).

Almost surely, 2^{20212211211221} is an apocalyptic number.

It is an amenable number.

20212211211221 is a deficient number, since it is larger than the sum of its proper divisors (89599792939).

20212211211221 is a wasteful number, since it uses less digits than its factorization.

20212211211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2452923.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 20212211211221 its reverse (12211211221202), we get a palindrome (32423422432423).

It can be divided in two parts, 202 and 12211211221, that multiplied together give a palindrome (2466664666642).

The spelling of 20212211211221 in words is "twenty trillion, two hundred twelve billion, two hundred eleven million, two hundred eleven thousand, two hundred twenty-one".