1012220121 has 24 divisors (see below), whose sum is σ = 1494841824. Its totient is φ = 604222080.

The previous prime is 1012220113. The next prime is 1012220149. The reversal of 1012220121 is 1210222101.

It is not a de Polignac number, because 1012220121 - 2³ = 1012220113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1012220097 and 1012220106.

It is not an unprimeable number, because it can be changed into a prime (1012220191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144721 + ... + 151553.

It is an arithmetic number, because the mean of its divisors is an integer number (62285076).

Almost surely, 2^1012220121 is an apocalyptic number.

1012220121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1012220121 is a deficient number, since it is larger than the sum of its proper divisors (482621703).

1012220121 is an equidigital number, since it uses as much as digits as its factorization.

1012220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6981 (or 6914 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1012220121 is about 31815.4069752376. The cubic root of 1012220121 is about 1004.0568930290.

Adding to 1012220121 its reverse (1210222101), we get a palindrome (2222442222).

It can be divided in two parts, 101 and 2220121, that added together give a palindrome (2220222).

The spelling of 1012220121 in words is "one billion, twelve million, two hundred twenty thousand, one hundred twenty-one".