1021121112001 has 4 divisors (see below), whose sum is σ = 1065517682112. Its totient is φ = 976724541892.

The previous prime is 1021121111987. The next prime is 1021121112007. The reversal of 1021121112001 is 1002111211201.

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 1021121112001 - 2⁹ = 1021121111489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021121112007) 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, 22198285021 + ... + 22198285066.

It is an arithmetic number, because the mean of its divisors is an integer number (266379420528).

Almost surely, 2^{1021121112001} is an apocalyptic number.

It is an amenable number.

1021121112001 is a deficient number, since it is larger than the sum of its proper divisors (44396570111).

1021121112001 is an equidigital number, since it uses as much as digits as its factorization.

1021121112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44396570110.

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

Adding to 1021121112001 its reverse (1002111211201), we get a palindrome (2023232323202).

The spelling of 1021121112001 in words is "one trillion, twenty-one billion, one hundred twenty-one million, one hundred twelve thousand, one".