1212211101000 has 128 divisors (see below), whose sum is σ = 3838548504960. Its totient is φ = 318431520000.

The previous prime is 1212211100987. The next prime is 1212211101041. The reversal of 1212211101000 is 1011122121.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 2814451 + ... + 3216450.

It is an arithmetic number, because the mean of its divisors is an integer number (29988660195).

Almost surely, 2^{1212211101000} is an apocalyptic number.

1212211101000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212211101000 is an abundant number, since it is smaller than the sum of its proper divisors (2626337403960).

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

1212211101000 is a wasteful number, since it uses less digits than its factorization.

1212211101000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6030992 (or 6030978 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1212211101000 its reverse (1011122121), we get a palindrome (1213222223121).

It can be divided in two parts, 121221 and 1101000, that added together give a palindrome (1222221).

The spelling of 1212211101000 in words is "one trillion, two hundred twelve billion, two hundred eleven million, one hundred one thousand".