1021121201121 has 32 divisors (see below), whose sum is σ = 1586312218368. Its totient is φ = 572141905920.

The previous prime is 1021121201077. The next prime is 1021121201131. The reversal of 1021121201121 is 1211021211201.

It is a happy number.

It is not a de Polignac number, because 1021121201121 - 2¹⁰ = 1021121200097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021121201121.

It is not an unprimeable number, because it can be changed into a prime (1021121201131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1567401 + ... + 2121081.

It is an arithmetic number, because the mean of its divisors is an integer number (49572256824).

Almost surely, 2^{1021121201121} is an apocalyptic number.

It is an amenable number.

1021121201121 is a deficient number, since it is larger than the sum of its proper divisors (565191017247).

1021121201121 is a wasteful number, since it uses less digits than its factorization.

1021121201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555401.

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

Adding to 1021121201121 its reverse (1211021211201), we get a palindrome (2232142412322).

The spelling of 1021121201121 in words is "one trillion, twenty-one billion, one hundred twenty-one million, two hundred one thousand, one hundred twenty-one".