221002001022 has 64 divisors (see below), whose sum is σ = 485278594560. Its totient is φ = 66541296000.

The previous prime is 221002001021. The next prime is 221002001027. The reversal of 221002001022 is 220100200122.

It is a junction number, because it is equal to n+sod(n) for n = 221002000989 and 221002001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221002001021) 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, 21449272 + ... + 21459572.

It is an arithmetic number, because the mean of its divisors is an integer number (7582478040).

Almost surely, 2^221002001022 is an apocalyptic number.

221002001022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221002001022 is an abundant number, since it is smaller than the sum of its proper divisors (264276593538).

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

221002001022 is a wasteful number, since it uses less digits than its factorization.

221002001022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12369.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 221002001022 its reverse (220100200122), we get a palindrome (441102201144).

Subtracting from 221002001022 its reverse (220100200122), we obtain a square (901800900 = 30030²).

The spelling of 221002001022 in words is "two hundred twenty-one billion, two million, one thousand, twenty-two".