1021260513 has 64 divisors (see below), whose sum is σ = 1791885312. Its totient is φ = 502571520.

The previous prime is 1021260511. The next prime is 1021260529. The reversal of 1021260513 is 3150621201.

It is not a de Polignac number, because 1021260513 - 2¹ = 1021260511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 1021260513.

It is not an unprimeable number, because it can be changed into a prime (1021260511) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 255456 + ... + 259422.

It is an arithmetic number, because the mean of its divisors is an integer number (27998208).

Almost surely, 2^1021260513 is an apocalyptic number.

1021260513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1021260513 is a deficient number, since it is larger than the sum of its proper divisors (770624799).

1021260513 is a wasteful number, since it uses less digits than its factorization.

1021260513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4054.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1021260513 is about 31957.1668487681. The cubic root of 1021260513 is about 1007.0371993265.

Adding to 1021260513 its reverse (3150621201), we get a palindrome (4171881714).

The spelling of 1021260513 in words is "one billion, twenty-one million, two hundred sixty thousand, five hundred thirteen".