1021123020551 has 4 divisors (see below), whose sum is σ = 1021712245032. Its totient is φ = 1020533796072.

The previous prime is 1021123020539. The next prime is 1021123020557. The reversal of 1021123020551 is 1550203211201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1021123020551 - 2³⁰ = 1020049278727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021123020557) 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, 294609641 + ... + 294613106.

It is an arithmetic number, because the mean of its divisors is an integer number (255428061258).

Almost surely, 2^{1021123020551} is an apocalyptic number.

1021123020551 is a deficient number, since it is larger than the sum of its proper divisors (589224481).

1021123020551 is an equidigital number, since it uses as much as digits as its factorization.

1021123020551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589224480.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 1021123020551 its reverse (1550203211201), we get a palindrome (2571326231752).

The spelling of 1021123020551 in words is "one trillion, twenty-one billion, one hundred twenty-three million, twenty thousand, five hundred fifty-one".