211220010020221 has 4 divisors (see below), whose sum is σ = 212484800499552. Its totient is φ = 209955219540892.

The previous prime is 211220010020177. The next prime is 211220010020249. The reversal of 211220010020221 is 122020010022112.

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 211220010020221 - 2¹⁹ = 211220009495933 is a prime.

It is a super-2 number, since 2×211220010020221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211220010020195 and 211220010020204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220010020321) 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, 632395239415 + ... + 632395239748.

It is an arithmetic number, because the mean of its divisors is an integer number (53121200124888).

Almost surely, 2^{211220010020221} is an apocalyptic number.

It is an amenable number.

211220010020221 is a deficient number, since it is larger than the sum of its proper divisors (1264790479331).

211220010020221 is a wasteful number, since it uses less digits than its factorization.

211220010020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264790479330.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 211220010020221 its reverse (122020010022112), we get a palindrome (333240020042333).

The spelling of 211220010020221 in words is "two hundred eleven trillion, two hundred twenty billion, ten million, twenty thousand, two hundred twenty-one".