221201213031 has 24 divisors (see below), whose sum is σ = 338733792384. Its totient is φ = 138853414080.

The previous prime is 221201213027. The next prime is 221201213047. The reversal of 221201213031 is 130312102122.

221201213031 is a `hidden beast` number, since 221 + 20 + 121 + 303 + 1 = 666.

221201213031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221201213031 - 2² = 221201213027 is a prime.

It is a super-2 number, since 2×221201213031² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221201212995 and 221201213013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201213011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10703676 + ... + 10724321.

It is an arithmetic number, because the mean of its divisors is an integer number (14113908016).

Almost surely, 2^221201213031 is an apocalyptic number.

221201213031 is a deficient number, since it is larger than the sum of its proper divisors (117532579353).

221201213031 is a wasteful number, since it uses less digits than its factorization.

221201213031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21428071 (or 21428068 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 221201213031 its reverse (130312102122), we get a palindrome (351513315153).

The spelling of 221201213031 in words is "two hundred twenty-one billion, two hundred one million, two hundred thirteen thousand, thirty-one".