1221210101000 has 64 divisors (see below), whose sum is σ = 2857965327360. Its totient is φ = 488427000000.

The previous prime is 1221210100997. The next prime is 1221210101039. The reversal of 1221210101000 is 1010121221.

It is a super-2 number, since 2×1221210101000² (a number of 25 digits) contains 22 as substring.

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, 9084275 + ... + 9217725.

It is an arithmetic number, because the mean of its divisors is an integer number (44655708240).

Almost surely, 2^{1221210101000} is an apocalyptic number.

1221210101000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221210101000 is an abundant number, since it is smaller than the sum of its proper divisors (1636755226360).

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

1221210101000 is a wasteful number, since it uses less digits than its factorization.

1221210101000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142623 (or 142609 counting only the distinct ones).

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

Adding to 1221210101000 its reverse (1010121221), we get a palindrome (1222220222221).

The spelling of 1221210101000 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, one hundred one thousand".