1020204521155 has 8 divisors (see below), whose sum is σ = 1226508359184. Its totient is φ = 814654994400.

The previous prime is 1020204521123. The next prime is 1020204521197. The reversal of 1020204521155 is 5511254020201.

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

It is not a de Polignac number, because 1020204521155 - 2⁵ = 1020204521123 is a prime.

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, 188574841 + ... + 188580250.

It is an arithmetic number, because the mean of its divisors is an integer number (153313544898).

Almost surely, 2^{1020204521155} is an apocalyptic number.

1020204521155 is a deficient number, since it is larger than the sum of its proper divisors (206303838029).

1020204521155 is an equidigital number, since it uses as much as digits as its factorization.

1020204521155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377155637.

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 1020204521155 its reverse (5511254020201), we get a palindrome (6531458541356).

The spelling of 1020204521155 in words is "one trillion, twenty billion, two hundred four million, five hundred twenty-one thousand, one hundred fifty-five".