221211221023 has 8 divisors (see below), whose sum is σ = 240453895248. Its totient is φ = 202286607744.

The previous prime is 221211220963. The next prime is 221211221047. The reversal of 221211221023 is 320122112122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221211221023 - 2²¹ = 221209123871 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 (221211231023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79513786 + ... + 79516567.

It is an arithmetic number, because the mean of its divisors is an integer number (30056736906).

Almost surely, 2^221211221023 is an apocalyptic number.

221211221023 is a deficient number, since it is larger than the sum of its proper divisors (19242674225).

221211221023 is a wasteful number, since it uses less digits than its factorization.

221211221023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159030473.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 221211221023 its reverse (320122112122), we get a palindrome (541333333145).

The spelling of 221211221023 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred twenty-one thousand, twenty-three".