1230135500021 has 6 divisors (see below), whose sum is σ = 1242194525910. Its totient is φ = 1218192426408.

The previous prime is 1230135500003. The next prime is 1230135500119. The reversal of 1230135500021 is 1200055310321.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1172540299921 + 57595200100 = 1082839^2 + 239990^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1230135500021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1230135500021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230135580021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 57965426 + ... + 57986643.

It is an arithmetic number, because the mean of its divisors is an integer number (207032420985).

Almost surely, 2^{1230135500021} is an apocalyptic number.

It is an amenable number.

1230135500021 is a deficient number, since it is larger than the sum of its proper divisors (12059025889).

1230135500021 is an equidigital number, since it uses as much as digits as its factorization.

1230135500021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115952275 (or 115952172 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The spelling of 1230135500021 in words is "one trillion, two hundred thirty billion, one hundred thirty-five million, five hundred thousand, twenty-one".