1221010101008 has 80 divisors (see below), whose sum is σ = 2481735801600. Its totient is φ = 580852766208.

The previous prime is 1221010100987. The next prime is 1221010101029. The reversal of 1221010101008 is 8001010101221.

It is an interprime number because it is at equal distance from previous prime (1221010100987) and next prime (1221010101029).

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, 61049666 + ... + 61069662.

It is an arithmetic number, because the mean of its divisors is an integer number (31021697520).

Almost surely, 2^{1221010101008} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221010101008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1240867900800).

1221010101008 is an abundant number, since it is smaller than the sum of its proper divisors (1260725700592).

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

1221010101008 is a wasteful number, since it uses less digits than its factorization.

1221010101008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20904 (or 20898 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1221010101008 its reverse (8001010101221), we get a palindrome (9222020202229).

The spelling of 1221010101008 in words is "one trillion, two hundred twenty-one billion, ten million, one hundred one thousand, eight".