1000220211221 has 96 divisors (see below), whose sum is σ = 1356100558848. Its totient is φ = 716289500160.

The previous prime is 1000220211173. The next prime is 1000220211229. The reversal of 1000220211221 is 1221120220001.

It is not a de Polignac number, because 1000220211221 - 2⁶ = 1000220211157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1000220211196 and 1000220211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000220211229) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 263006306 + ... + 263010108.

It is an arithmetic number, because the mean of its divisors is an integer number (14126047488).

Almost surely, 2^{1000220211221} is an apocalyptic number.

1000220211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1000220211221 is a deficient number, since it is larger than the sum of its proper divisors (355880347627).

1000220211221 is a wasteful number, since it uses less digits than its factorization.

1000220211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4131 (or 4114 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1000220211221 its reverse (1221120220001), we get a palindrome (2221340431222).

The spelling of 1000220211221 in words is "one trillion, two hundred twenty million, two hundred eleven thousand, two hundred twenty-one".