221020212031 has 8 divisors (see below), whose sum is σ = 236338446384. Its totient is φ = 205959427200.

The previous prime is 221020212019. The next prime is 221020212107. The reversal of 221020212031 is 130212020122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221020212031 - 2⁷ = 221020211903 is a prime.

It is a super-2 number, since 2×221020212031² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221020211996 and 221020212014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020242031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64360605 + ... + 64364038.

It is an arithmetic number, because the mean of its divisors is an integer number (29542305798).

Almost surely, 2^221020212031 is an apocalyptic number.

221020212031 is a deficient number, since it is larger than the sum of its proper divisors (15318234353).

221020212031 is a wasteful number, since it uses less digits than its factorization.

221020212031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128724761.

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

Adding to 221020212031 its reverse (130212020122), we get a palindrome (351232232153).

The spelling of 221020212031 in words is "two hundred twenty-one billion, twenty million, two hundred twelve thousand, thirty-one".