1021242513 has 24 divisors (see below), whose sum is σ = 1481874912. Its totient is φ = 623418624.

The previous prime is 1021242499. The next prime is 1021242529. The reversal of 1021242513 is 3152421201.

It is not a de Polignac number, because 1021242513 - 2¹⁸ = 1020980369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021242513.

It is not an unprimeable number, because it can be changed into a prime (1021242583) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62506 + ... + 77132.

It is an arithmetic number, because the mean of its divisors is an integer number (61744788).

Almost surely, 2^1021242513 is an apocalyptic number.

It is an amenable number.

1021242513 is a deficient number, since it is larger than the sum of its proper divisors (460632399).

1021242513 is a wasteful number, since it uses less digits than its factorization.

1021242513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14721 (or 14684 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1021242513 is about 31956.8852205593. The cubic root of 1021242513 is about 1007.0312828550.

Adding to 1021242513 its reverse (3152421201), we get a palindrome (4173663714).

It can be divided in two parts, 10212 and 42513, that added together give a palindrome (52725).

The spelling of 1021242513 in words is "one billion, twenty-one million, two hundred forty-two thousand, five hundred thirteen".