221002222121121 has 32 divisors (see below), whose sum is σ = 347630871011328. Its totient is φ = 122212442689920.

The previous prime is 221002222121011. The next prime is 221002222121123. The reversal of 221002222121121 is 121121222200122.

It is not a de Polignac number, because 221002222121121 - 2¹³ = 221002222112929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (221002222121123) 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, 111821110 + ... + 113780336.

It is an arithmetic number, because the mean of its divisors is an integer number (10863464719104).

Almost surely, 2^{221002222121121} is an apocalyptic number.

221002222121121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221002222121121 is a deficient number, since it is larger than the sum of its proper divisors (126628648890207).

221002222121121 is a wasteful number, since it uses less digits than its factorization.

221002222121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132541.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221002222121121 its reverse (121121222200122), we get a palindrome (342123444321243).

The spelling of 221002222121121 in words is "two hundred twenty-one trillion, two billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred twenty-one".