1025520001221 has 8 divisors (see below), whose sum is σ = 1367446974880. Its totient is φ = 683636514192.

The previous prime is 1025520001159. The next prime is 1025520001223. The reversal of 1025520001221 is 1221000255201.

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

It is not a de Polignac number, because 1025520001221 - 2²³ = 1025511612613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025520001223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10816591 + ... + 10910988.

It is an arithmetic number, because the mean of its divisors is an integer number (170930871860).

Almost surely, 2^{1025520001221} is an apocalyptic number.

It is an amenable number.

1025520001221 is a deficient number, since it is larger than the sum of its proper divisors (341926973659).

1025520001221 is a wasteful number, since it uses less digits than its factorization.

1025520001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21743315.

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 1025520001221 its reverse (1221000255201), we get a palindrome (2246520256422).

The spelling of 1025520001221 in words is "one trillion, twenty-five billion, five hundred twenty million, one thousand, two hundred twenty-one".