1020121132555 has 16 divisors (see below), whose sum is σ = 1421958078144. Its totient is φ = 688044228480.

The previous prime is 1020121132523. The next prime is 1020121132559. The reversal of 1020121132555 is 5552311210201.

It is a happy number.

It is not a de Polignac number, because 1020121132555 - 2⁵ = 1020121132523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020121132559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238902112 + ... + 238906381.

It is an arithmetic number, because the mean of its divisors is an integer number (88872379884).

Almost surely, 2^{1020121132555} is an apocalyptic number.

1020121132555 is a deficient number, since it is larger than the sum of its proper divisors (401836945589).

1020121132555 is an equidigital number, since it uses as much as digits as its factorization.

1020121132555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477808566.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 1020121132555 its reverse (5552311210201), we get a palindrome (6572432342756).

The spelling of 1020121132555 in words is "one trillion, twenty billion, one hundred twenty-one million, one hundred thirty-two thousand, five hundred fifty-five".