1211020020221 has 8 divisors (see below), whose sum is σ = 1322650725600. Its totient is φ = 1099645644240.

The previous prime is 1211020020187. The next prime is 1211020020227. The reversal of 1211020020221 is 1220200201121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211020020221 - 2¹⁰ = 1211020019197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211020020196 and 1211020020205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211020020227) 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, 64072466 + ... + 64091363.

It is an arithmetic number, because the mean of its divisors is an integer number (165331340700).

Almost surely, 2^{1211020020221} is an apocalyptic number.

1211020020221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211020020221 is a deficient number, since it is larger than the sum of its proper divisors (111630705379).

1211020020221 is a wasteful number, since it uses less digits than its factorization.

1211020020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128164699.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1211020020221 its reverse (1220200201121), we get a palindrome (2431220221342).

The spelling of 1211020020221 in words is "one trillion, two hundred eleven billion, twenty million, twenty thousand, two hundred twenty-one".