221111212122021 has 32 divisors (see below), whose sum is σ = 331670571079680. Its totient is φ = 130005685427904.

The previous prime is 221111212121983. The next prime is 221111212122023. The reversal of 221111212122021 is 120221212111122.

221111212122021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221111212122021 - 2⁷ = 221111212121893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221111212122023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138156331 + ... + 139747608.

It is an arithmetic number, because the mean of its divisors is an integer number (10364705346240).

Almost surely, 2^{221111212122021} is an apocalyptic number.

It is an amenable number.

221111212122021 is a deficient number, since it is larger than the sum of its proper divisors (110559358957659).

221111212122021 is a wasteful number, since it uses less digits than its factorization.

221111212122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277904865.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221111212122021 its reverse (120221212111122), we get a palindrome (341332424233143).

The spelling of 221111212122021 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred twelve million, one hundred twenty-two thousand, twenty-one".