221002122031 has 4 divisors (see below), whose sum is σ = 221235493752. Its totient is φ = 220768750312.

The previous prime is 221002122007. The next prime is 221002122049. The reversal of 221002122031 is 130221200122.

It is a happy number.

221002122031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221002122031 - 2⁷ = 221002121903 is a prime.

It is a super-2 number, since 2×221002122031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221002121996 and 221002122014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221002122001) 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 3 ways as a sum of consecutive naturals, for example, 116684440 + ... + 116686333.

It is an arithmetic number, because the mean of its divisors is an integer number (55308873438).

Almost surely, 2^221002122031 is an apocalyptic number.

221002122031 is a deficient number, since it is larger than the sum of its proper divisors (233371721).

221002122031 is an equidigital number, since it uses as much as digits as its factorization.

221002122031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233371720.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 221002122031 its reverse (130221200122), we get a palindrome (351223322153).

The spelling of 221002122031 in words is "two hundred twenty-one billion, two million, one hundred twenty-two thousand, thirty-one".