221021020122 has 16 divisors (see below), whose sum is σ = 505190903232. Its totient is φ = 63148862880.

The previous prime is 221021020117. The next prime is 221021020127. The reversal of 221021020122 is 221020120122.

It is an interprime number because it is at equal distance from previous prime (221021020117) and next prime (221021020127).

It is not an unprimeable number, because it can be changed into a prime (221021020127) 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 7 ways as a sum of consecutive naturals, for example, 2631202579 + ... + 2631202662.

It is an arithmetic number, because the mean of its divisors is an integer number (31574431452).

Almost surely, 2^221021020122 is an apocalyptic number.

221021020122 is an abundant number, since it is smaller than the sum of its proper divisors (284169883110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221021020122 is a wasteful number, since it uses less digits than its factorization.

221021020122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5262405253.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221021020122 its reverse (221020120122), we get a palindrome (442041140244).

The spelling of 221021020122 in words is "two hundred twenty-one billion, twenty-one million, twenty thousand, one hundred twenty-two".