221111012201021 has 16 divisors (see below), whose sum is σ = 222210819547200. Its totient is φ = 220013626761600.

The previous prime is 221111012200999. The next prime is 221111012201077. The reversal of 221111012201021 is 120102210111122.

221111012201021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 221111012201021 - 2¹⁰ = 221111012199997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221111012201921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 616534526 + ... + 616893056.

It is an arithmetic number, because the mean of its divisors is an integer number (13888176221700).

Almost surely, 2^{221111012201021} is an apocalyptic number.

It is an amenable number.

221111012201021 is a deficient number, since it is larger than the sum of its proper divisors (1099807346179).

221111012201021 is a wasteful number, since it uses less digits than its factorization.

221111012201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361900.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221111012201021 its reverse (120102210111122), we get a palindrome (341213222312143).

The spelling of 221111012201021 in words is "two hundred twenty-one trillion, one hundred eleven billion, twelve million, two hundred one thousand, twenty-one".