1000212121000 has 64 divisors (see below), whose sum is σ = 2394926614080. Its totient is φ = 390780532800.

The previous prime is 1000212120977. The next prime is 1000212121033. The reversal of 1000212121000 is 1212120001.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11587374 + ... + 11673373.

It is an arithmetic number, because the mean of its divisors is an integer number (37420728345).

Almost surely, 2^{1000212121000} is an apocalyptic number.

1000212121000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000212121000 is an abundant number, since it is smaller than the sum of its proper divisors (1394714493080).

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

1000212121000 is a wasteful number, since it uses less digits than its factorization.

1000212121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23260811 (or 23260797 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1000212121000 its reverse (1212120001), we get a palindrome (1001424241001).

Subtracting from 1000212121000 its reverse (1212120001), we obtain a palindrome (999000000999).

The spelling of 1000212121000 in words is "one trillion, two hundred twelve million, one hundred twenty-one thousand".