221112220021 has 32 divisors (see below), whose sum is σ = 278240071680. Its totient is φ = 170697585600.

The previous prime is 221112219953. The next prime is 221112220027. The reversal of 221112220021 is 120022211122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221112220021 - 2⁹ = 221112219509 is a prime.

It is a super-2 number, since 2×221112220021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221112219977 and 221112220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221112220027) 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, 3705595 + ... + 3764791.

It is an arithmetic number, because the mean of its divisors is an integer number (8695002240).

Almost surely, 2^221112220021 is an apocalyptic number.

It is an amenable number.

221112220021 is a deficient number, since it is larger than the sum of its proper divisors (57127851659).

221112220021 is a wasteful number, since it uses less digits than its factorization.

221112220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59665.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221112220021 its reverse (120022211122), we get a palindrome (341134431143).

The spelling of 221112220021 in words is "two hundred twenty-one billion, one hundred twelve million, two hundred twenty thousand, twenty-one".