221021020331 has 4 divisors (see below), whose sum is σ = 221022811464. Its totient is φ = 221019229200.

The previous prime is 221021020309. The next prime is 221021020349. The reversal of 221021020331 is 133020120122.

221021020331 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 221021020331 - 2⁶ = 221021020267 is a prime.

It is a super-2 number, since 2×221021020331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021020361) 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, 695585 + ... + 962226.

It is an arithmetic number, because the mean of its divisors is an integer number (55255702866).

Almost surely, 2^221021020331 is an apocalyptic number.

221021020331 is a deficient number, since it is larger than the sum of its proper divisors (1791133).

221021020331 is a wasteful number, since it uses less digits than its factorization.

221021020331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1791132.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 221021020331 its reverse (133020120122), we get a palindrome (354041140453).

The spelling of 221021020331 in words is "two hundred twenty-one billion, twenty-one million, twenty thousand, three hundred thirty-one".