1021121121121 has 4 divisors (see below), whose sum is σ = 1021260874032. Its totient is φ = 1020981368212.

The previous prime is 1021121121107. The next prime is 1021121121133. The reversal of 1021121121121 is 1211211211201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1021121121121 - 2²³ = 1021112732513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021121121095 and 1021121121104.

It is not an unprimeable number, because it can be changed into a prime (1021121121221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69865495 + ... + 69880108.

It is an arithmetic number, because the mean of its divisors is an integer number (255315218508).

Almost surely, 2^{1021121121121} is an apocalyptic number.

It is an amenable number.

1021121121121 is a deficient number, since it is larger than the sum of its proper divisors (139752911).

1021121121121 is an equidigital number, since it uses as much as digits as its factorization.

1021121121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139752910.

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

Adding to 1021121121121 its reverse (1211211211201), we get a palindrome (2232332332322).

The spelling of 1021121121121 in words is "one trillion, twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred twenty-one".