221010021010021 has 4 divisors (see below), whose sum is σ = 221036448140352. Its totient is φ = 220983593879692.

The previous prime is 221010021010019. The next prime is 221010021010127. The reversal of 221010021010021 is 120010120010122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221010021010021 - 2¹ = 221010021010019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221010021009983 and 221010021010010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221010021010001) 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 3 ways as a sum of consecutive naturals, for example, 13213552621 + ... + 13213569346.

It is an arithmetic number, because the mean of its divisors is an integer number (55259112035088).

Almost surely, 2^{221010021010021} is an apocalyptic number.

It is an amenable number.

221010021010021 is a deficient number, since it is larger than the sum of its proper divisors (26427130331).

221010021010021 is an equidigital number, since it uses as much as digits as its factorization.

221010021010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26427130330.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221010021010021 its reverse (120010120010122), we get a palindrome (341020141020143).

The spelling of 221010021010021 in words is "two hundred twenty-one trillion, ten billion, twenty-one million, ten thousand, twenty-one".