1212111001000 has 64 divisors (see below), whose sum is σ = 2870512706880. Its totient is φ = 479002868800.

The previous prime is 1212111000937. The next prime is 1212111001019. The reversal of 1212111001000 is 1001112121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7218874 + ... + 7384873.

It is an arithmetic number, because the mean of its divisors is an integer number (44851761045).

Almost surely, 2^{1212111001000} is an apocalyptic number.

1212111001000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212111001000 is an abundant number, since it is smaller than the sum of its proper divisors (1658401705880).

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

1212111001000 is a wasteful number, since it uses less digits than its factorization.

1212111001000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14603851 (or 14603837 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1212111001000 its reverse (1001112121), we get a palindrome (1213112113121).

It can be divided in two parts, 121211 and 1001000, that added together give a palindrome (1122211).

The spelling of 1212111001000 in words is "one trillion, two hundred twelve billion, one hundred eleven million, one thousand".