1021233451520 has 160 divisors (see below), whose sum is σ = 2461790935296. Its totient is φ = 406292889600.

The previous prime is 1021233451519. The next prime is 1021233451531. The reversal of 1021233451520 is 251543321201.

It is a tau number, because it is divible by the number of its divisors (160).

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, 650052335 + ... + 650053905.

Almost surely, 2^{1021233451520} is an apocalyptic number.

1021233451520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021233451520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1230895467648).

1021233451520 is an abundant number, since it is smaller than the sum of its proper divisors (1440557483776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021233451520 is an equidigital number, since it uses as much as digits as its factorization.

1021233451520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2802 (or 2786 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 1021233451520 its reverse (251543321201), we get a palindrome (1272776772721).

The spelling of 1021233451520 in words is "one trillion, twenty-one billion, two hundred thirty-three million, four hundred fifty-one thousand, five hundred twenty".