12121001010 has 48 divisors (see below), whose sum is σ = 31645425240. Its totient is φ = 3218849280.

The previous prime is 12121000993. The next prime is 12121001017. The reversal of 12121001010 is 1010012121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11662056081 + 458944929 = 107991^2 + 21423^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 12121000983 and 12121001001.

It is not an unprimeable number, because it can be changed into a prime (12121001017) 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, 257725 + ... + 301104.

Almost surely, 2^12121001010 is an apocalyptic number.

12121001010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12121001010 is an abundant number, since it is smaller than the sum of its proper divisors (19524424230).

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

12121001010 is a wasteful number, since it uses less digits than its factorization.

12121001010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559083 (or 559080 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 12121001010 its reverse (1010012121), we get a palindrome (13131013131).

The spelling of 12121001010 in words is "twelve billion, one hundred twenty-one million, one thousand, ten".