221021012021021 has 8 divisors (see below), whose sum is σ = 227057484698880. Its totient is φ = 214987851543888.

The previous prime is 221021012020943. The next prime is 221021012021083. The reversal of 221021012021021 is 120120210120122.

221021012021021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-221021012021021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021012021221) 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, 827914901 + ... + 828181818.

It is an arithmetic number, because the mean of its divisors is an integer number (28382185587360).

Almost surely, 2^{221021012021021} is an apocalyptic number.

It is an amenable number.

221021012021021 is a deficient number, since it is larger than the sum of its proper divisors (6036472677859).

221021012021021 is a wasteful number, since it uses less digits than its factorization.

221021012021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656100363.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221021012021021 its reverse (120120210120122), we get a palindrome (341141222141143).

The spelling of 221021012021021 in words is "two hundred twenty-one trillion, twenty-one billion, twelve million, twenty-one thousand, twenty-one".