1221210101121 has 8 divisors (see below), whose sum is σ = 1628400330720. Its totient is φ = 814079969472.

The previous prime is 1221210101101. The next prime is 1221210101123. The reversal of 1221210101121 is 1211010121221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221210101121 - 2¹⁷ = 1221209970049 is a prime.

It is a super-2 number, since 2×1221210101121² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221210101121.

It is not an unprimeable number, because it can be changed into a prime (1221210101123) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14977051 + ... + 15058368.

It is an arithmetic number, because the mean of its divisors is an integer number (203550041340).

Almost surely, 2^{1221210101121} is an apocalyptic number.

It is an amenable number.

1221210101121 is a deficient number, since it is larger than the sum of its proper divisors (407190229599).

1221210101121 is a wasteful number, since it uses less digits than its factorization.

1221210101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30048975.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221210101121 its reverse (1211010121221), we get a palindrome (2432220222342).

The spelling of 1221210101121 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, one hundred one thousand, one hundred twenty-one".