221020012121 has 8 divisors (see below), whose sum is σ = 221735029824. Its totient is φ = 220305106960.

The previous prime is 221020012069. The next prime is 221020012139. The reversal of 221020012121 is 121210020122.

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-221020012121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221020012096 and 221020012105.

It is not an unprimeable number, because it can be changed into a prime (221020002121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5919116 + ... + 5956338.

It is an arithmetic number, because the mean of its divisors is an integer number (27716878728).

Almost surely, 2^221020012121 is an apocalyptic number.

It is an amenable number.

221020012121 is a deficient number, since it is larger than the sum of its proper divisors (715017703).

221020012121 is a wasteful number, since it uses less digits than its factorization.

221020012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56271.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221020012121 its reverse (121210020122), we get a palindrome (342230032243).

The spelling of 221020012121 in words is "two hundred twenty-one billion, twenty million, twelve thousand, one hundred twenty-one".