1210221100121 has 16 divisors (see below), whose sum is σ = 1366123682880. Its totient is φ = 1062540568320.

The previous prime is 1210221100111. The next prime is 1210221100133. The reversal of 1210221100121 is 1210011220121.

It is not a de Polignac number, because 1210221100121 - 2¹⁴ = 1210221083737 is a prime.

It is a super-2 number, since 2×1210221100121² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1210221100096 and 1210221100105.

It is not an unprimeable number, because it can be changed into a prime (1210221100111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14332100 + ... + 14416293.

It is an arithmetic number, because the mean of its divisors is an integer number (85382730180).

Almost surely, 2^{1210221100121} is an apocalyptic number.

1210221100121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210221100121 is a deficient number, since it is larger than the sum of its proper divisors (155902582759).

1210221100121 is a wasteful number, since it uses less digits than its factorization.

1210221100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28748536.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1210221100121 its reverse (1210011220121), we get a palindrome (2420232320242).

The spelling of 1210221100121 in words is "one trillion, two hundred ten billion, two hundred twenty-one million, one hundred thousand, one hundred twenty-one".