221012333021 has 8 divisors (see below), whose sum is σ = 223334477400. Its totient is φ = 218692814400.

The previous prime is 221012333011. The next prime is 221012333071. The reversal of 221012333021 is 120333210122.

It can be written as a sum of positive squares in 4 ways, for example, as 33229644100 + 187782688921 = 182290^2 + 433339^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221012333021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221012332984 and 221012333002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012333011) 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, 486986 + ... + 824123.

It is an arithmetic number, because the mean of its divisors is an integer number (27916809675).

Almost surely, 2^221012333021 is an apocalyptic number.

It is an amenable number.

221012333021 is a deficient number, since it is larger than the sum of its proper divisors (2322144379).

221012333021 is a wasteful number, since it uses less digits than its factorization.

221012333021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312879.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 221012333021 its reverse (120333210122), we get a palindrome (341345543143).

The spelling of 221012333021 in words is "two hundred twenty-one billion, twelve million, three hundred thirty-three thousand, twenty-one".