1021126234405 has 4 divisors (see below), whose sum is σ = 1225351481292. Its totient is φ = 816900987520.

The previous prime is 1021126234393. The next prime is 1021126234409. The reversal of 1021126234405 is 5044326211201.

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

It can be written as a sum of positive squares in 2 ways, for example, as 559457624961 + 461668609444 = 747969^2 + 679462^2 .

It is not a de Polignac number, because 1021126234405 - 2³⁷ = 883687280933 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 (1021126234409) 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, 102112623436 + ... + 102112623445.

It is an arithmetic number, because the mean of its divisors is an integer number (306337870323).

Almost surely, 2^{1021126234405} is an apocalyptic number.

It is an amenable number.

1021126234405 is a deficient number, since it is larger than the sum of its proper divisors (204225246887).

1021126234405 is an equidigital number, since it uses as much as digits as its factorization.

1021126234405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204225246886.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 1021126234405 in words is "one trillion, twenty-one billion, one hundred twenty-six million, two hundred thirty-four thousand, four hundred five".