1020123223505 has 8 divisors (see below), whose sum is σ = 1224153309312. Its totient is φ = 816094951408.

The previous prime is 1020123223481. The next prime is 1020123223517. The reversal of 1020123223505 is 5053223210201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020123223505 is a prime.

It is a super-2 number, since 2×1020123223505² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1822514 + ... + 2315556.

It is an arithmetic number, because the mean of its divisors is an integer number (153019163664).

Almost surely, 2^{1020123223505} is an apocalyptic number.

It is an amenable number.

1020123223505 is a deficient number, since it is larger than the sum of its proper divisors (204030085807).

1020123223505 is an equidigital number, since it uses as much as digits as its factorization.

1020123223505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906855.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 1020123223505 its reverse (5053223210201), we get a palindrome (6073346433706).

The spelling of 1020123223505 in words is "one trillion, twenty billion, one hundred twenty-three million, two hundred twenty-three thousand, five hundred five".