221871621411 has 12 divisors (see below), whose sum is σ = 349615888440. Its totient is φ = 134467649280.

The previous prime is 221871621353. The next prime is 221871621457. The reversal of 221871621411 is 114126178122.

221871621411 is a `hidden beast` number, since 2 + 2 + 1 + 87 + 162 + 1 + 411 = 666.

It is not a de Polignac number, because 221871621411 - 2⁶ = 221871621347 is a prime.

It is a super-2 number, since 2×221871621411² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221871621481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1120563646 + ... + 1120563843.

It is an arithmetic number, because the mean of its divisors is an integer number (29134657370).

Almost surely, 2^221871621411 is an apocalyptic number.

221871621411 is a deficient number, since it is larger than the sum of its proper divisors (127744267029).

221871621411 is a wasteful number, since it uses less digits than its factorization.

221871621411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2241127506 (or 2241127503 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

Adding to 221871621411 its reverse (114126178122), we get a palindrome (335997799533).

The spelling of 221871621411 in words is "two hundred twenty-one billion, eight hundred seventy-one million, six hundred twenty-one thousand, four hundred eleven".