1021312201525 has 96 divisors (see below), whose sum is σ = 1672434957312. Its totient is φ = 598983859200.

The previous prime is 1021312201513. The next prime is 1021312201561. The reversal of 1021312201525 is 5251022131201.

It is a happy number.

It is not a de Polignac number, because 1021312201525 - 2⁷ = 1021312201397 is a prime.

It is a super-2 number, since 2×1021312201525² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 1021312201525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 129161622 + ... + 129169528.

It is an arithmetic number, because the mean of its divisors is an integer number (17421197472).

Almost surely, 2^{1021312201525} is an apocalyptic number.

It is an amenable number.

1021312201525 is a deficient number, since it is larger than the sum of its proper divisors (651122755787).

1021312201525 is a wasteful number, since it uses less digits than its factorization.

1021312201525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11899 (or 11894 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 1021312201525 its reverse (5251022131201), we get a palindrome (6272334332726).

The spelling of 1021312201525 in words is "one trillion, twenty-one billion, three hundred twelve million, two hundred one thousand, five hundred twenty-five".