1212121001000 has 128 divisors (see below), whose sum is σ = 3490908744960. Its totient is φ = 383616288000.

The previous prime is 1212121000999. The next prime is 1212121001011. The reversal of 1212121001000 is 1001212121.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6569006 + ... + 6751005.

It is an arithmetic number, because the mean of its divisors is an integer number (27272724570).

Almost surely, 2^{1212121001000} is an apocalyptic number.

1212121001000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212121001000 is an abundant number, since it is smaller than the sum of its proper divisors (2278787743960).

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

1212121001000 is a wasteful number, since it uses less digits than its factorization.

1212121001000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13320052 (or 13320038 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1212121001000 its reverse (1001212121), we get a palindrome (1213122213121).

The spelling of 1212121001000 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, one thousand".