1021513055 has 16 divisors (see below), whose sum is σ = 1306675200. Its totient is φ = 764393760.

The previous prime is 1021513027. The next prime is 1021513123. The reversal of 1021513055 is 5503151201.

It is a happy number.

It is not a de Polignac number, because 1021513055 - 2⁸ = 1021512799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021513055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60551 + ... + 75560.

It is an arithmetic number, because the mean of its divisors is an integer number (81667200).

Almost surely, 2^1021513055 is an apocalyptic number.

1021513055 is a deficient number, since it is larger than the sum of its proper divisors (285162145).

1021513055 is a wasteful number, since it uses less digits than its factorization.

1021513055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136214.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 1021513055 is about 31961.1178621775. The cubic root of 1021513055 is about 1007.1202007497.

Adding to 1021513055 its reverse (5503151201), we get a palindrome (6524664256).

The spelling of 1021513055 in words is "one billion, twenty-one million, five hundred thirteen thousand, fifty-five".