11211022021221 has 64 divisors (see below), whose sum is σ = 18764898566400. Its totient is φ = 6552812851200.

The previous prime is 11211022021211. The next prime is 11211022021231. The reversal of 11211022021221 is 12212022011211.

11211022021221 is a `hidden beast` number, since 1 + 1 + 211 + 0 + 220 + 212 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (11211022021211) and next prime (11211022021231).

It is not a de Polignac number, because 11211022021221 - 2³⁷ = 11073583067749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11211022021194 and 11211022021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211022021211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6849325 + ... + 8326781.

It is an arithmetic number, because the mean of its divisors is an integer number (293201540100).

Almost surely, 2^{11211022021221} is an apocalyptic number.

11211022021221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11211022021221 is a deficient number, since it is larger than the sum of its proper divisors (7553876545179).

11211022021221 is a wasteful number, since it uses less digits than its factorization.

11211022021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478387 (or 1478381 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 11211022021221 its reverse (12212022011211), we get a palindrome (23423044032432).

The spelling of 11211022021221 in words is "eleven trillion, two hundred eleven billion, twenty-two million, twenty-one thousand, two hundred twenty-one".