123036021536 has 12 divisors (see below), whose sum is σ = 242227167462. Its totient is φ = 61518010752.

The previous prime is 123036021533. The next prime is 123036021541. The reversal of 123036021536 is 635120630321.

It can be written as a sum of positive squares in only one way, i.e., 123029771536 + 6250000 = 350756^2 + 2500^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 3844875673 = 123036021536 / (1 + 2 + 3 + 0 + 3 + 6 + 0 + 2 + 1 + 5 + 3 + 6).

It is not an unprimeable number, because it can be changed into a prime (123036021533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1922437805 + ... + 1922437868.

Almost surely, 2^123036021536 is an apocalyptic number.

123036021536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

123036021536 is a deficient number, since it is larger than the sum of its proper divisors (119191145926).

123036021536 is an equidigital number, since it uses as much as digits as its factorization.

123036021536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3844875683 (or 3844875675 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 32.

Adding to 123036021536 its reverse (635120630321), we get a palindrome (758156651857).

The spelling of 123036021536 in words is "one hundred twenty-three billion, thirty-six million, twenty-one thousand, five hundred thirty-six".