221021011120221 has 32 divisors (see below), whose sum is σ = 352838157701120. Its totient is φ = 135931141870272.

The previous prime is 221021011120213. The next prime is 221021011120229. The reversal of 221021011120221 is 122021110120122.

221021011120221 is a `hidden beast` number, since 2 + 210 + 210 + 1 + 1 + 1 + 20 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (221021011120213) and next prime (221021011120229).

It is not a de Polignac number, because 221021011120221 - 2³ = 221021011120213 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221021011120194 and 221021011120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021011120229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 188739646 + ... + 189907071.

It is an arithmetic number, because the mean of its divisors is an integer number (11026192428160).

Almost surely, 2^{221021011120221} is an apocalyptic number.

It is an amenable number.

221021011120221 is a deficient number, since it is larger than the sum of its proper divisors (131817146580899).

221021011120221 is a wasteful number, since it uses less digits than its factorization.

221021011120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378648402 (or 378648396 counting only the distinct ones).

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

Adding to 221021011120221 its reverse (122021110120122), we get a palindrome (343042121240343).

The spelling of 221021011120221 in words is "two hundred twenty-one trillion, twenty-one billion, eleven million, one hundred twenty thousand, two hundred twenty-one".