221020200031 has 4 divisors (see below), whose sum is σ = 221134542472. Its totient is φ = 220905857592.

The previous prime is 221020200019. The next prime is 221020200047. The reversal of 221020200031 is 130002020122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221020200031 is a prime.

It is a super-2 number, since 2×221020200031² (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 = 221020199984 and 221020200020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020230031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57168321 + ... + 57172186.

It is an arithmetic number, because the mean of its divisors is an integer number (55283635618).

Almost surely, 2^221020200031 is an apocalyptic number.

221020200031 is a deficient number, since it is larger than the sum of its proper divisors (114342441).

221020200031 is a wasteful number, since it uses less digits than its factorization.

221020200031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114342440.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 221020200031 its reverse (130002020122), we get a palindrome (351022220153).

The spelling of 221020200031 in words is "two hundred twenty-one billion, twenty million, two hundred thousand, thirty-one".