1021001211121 has 4 divisors (see below), whose sum is σ = 1021100899312. Its totient is φ = 1020901522932.

The previous prime is 1021001211103. The next prime is 1021001211143. The reversal of 1021001211121 is 1211121001201.

It is a happy number.

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 1021001211121 - 2⁷ = 1021001210993 is a prime.

It is a super-2 number, since 2×1021001211121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021001211421) 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, 49828731 + ... + 49849216.

It is an arithmetic number, because the mean of its divisors is an integer number (255275224828).

Almost surely, 2^{1021001211121} is an apocalyptic number.

It is an amenable number.

1021001211121 is a deficient number, since it is larger than the sum of its proper divisors (99688191).

1021001211121 is an equidigital number, since it uses as much as digits as its factorization.

1021001211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99688190.

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

Adding to 1021001211121 its reverse (1211121001201), we get a palindrome (2232122212322).

The spelling of 1021001211121 in words is "one trillion, twenty-one billion, one million, two hundred eleven thousand, one hundred twenty-one".