1210021011121 has 16 divisors (see below), whose sum is σ = 1316276590720. Its totient is φ = 1105656531840.

The previous prime is 1210021011113. The next prime is 1210021011139. The reversal of 1210021011121 is 1211101200121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1210021011121 - 2³ = 1210021011113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (1210021011181) 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, 3196390 + ... + 3554848.

It is an arithmetic number, because the mean of its divisors is an integer number (82267286920).

Almost surely, 2^{1210021011121} is an apocalyptic number.

It is an amenable number.

1210021011121 is a deficient number, since it is larger than the sum of its proper divisors (106255579599).

1210021011121 is a wasteful number, since it uses less digits than its factorization.

1210021011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361096.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1210021011121 its reverse (1211101200121), we get a palindrome (2421122211242).

The spelling of 1210021011121 in words is "one trillion, two hundred ten billion, twenty-one million, eleven thousand, one hundred twenty-one".