211220133301221 has 16 divisors (see below), whose sum is σ = 307231341408768. Its totient is φ = 128011345081200.

The previous prime is 211220133301213. The next prime is 211220133301249. The reversal of 211220133301221 is 122103331022112.

It is not a de Polignac number, because 211220133301221 - 2³ = 211220133301213 is a prime.

It is a super-2 number, since 2×211220133301221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211220133301191 and 211220133301200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220133301321) 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, 16400971 + ... + 26295096.

It is an arithmetic number, because the mean of its divisors is an integer number (19201958838048).

Almost surely, 2^{211220133301221} is an apocalyptic number.

It is an amenable number.

211220133301221 is a deficient number, since it is larger than the sum of its proper divisors (96011208107547).

211220133301221 is a wasteful number, since it uses less digits than its factorization.

211220133301221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42845992.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 211220133301221 its reverse (122103331022112), we get a palindrome (333323464323333).

The spelling of 211220133301221 in words is "two hundred eleven trillion, two hundred twenty billion, one hundred thirty-three million, three hundred one thousand, two hundred twenty-one".