221020100111021 has 8 divisors (see below), whose sum is σ = 229010855239200. Its totient is φ = 213053969807280.

The previous prime is 221020100110961. The next prime is 221020100111051. The reversal of 221020100111021 is 120111001020122.

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 221020100111021 - 2³⁴ = 221002920241837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221020100110987 and 221020100111005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020100111051) 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, 6156187835 + ... + 6156223736.

It is an arithmetic number, because the mean of its divisors is an integer number (28626356904900).

Almost surely, 2^{221020100111021} is an apocalyptic number.

It is an amenable number.

221020100111021 is a deficient number, since it is larger than the sum of its proper divisors (7990755128179).

221020100111021 is a wasteful number, since it uses less digits than its factorization.

221020100111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12312412219.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221020100111021 its reverse (120111001020122), we get a palindrome (341131101131143).

The spelling of 221020100111021 in words is "two hundred twenty-one trillion, twenty billion, one hundred million, one hundred eleven thousand, twenty-one".