1520321023340 has 72 divisors (see below), whose sum is σ = 3716242014240. Its totient is φ = 520928018688.

The previous prime is 1520321023313. The next prime is 1520321023369. The reversal of 1520321023340 is 433201230251.

It is a happy number.

It is a super-2 number, since 2×1520321023340² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1092176 + ... + 2057544.

It is an arithmetic number, because the mean of its divisors is an integer number (51614472420).

Almost surely, 2^{1520321023340} is an apocalyptic number.

1520321023340 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 1520321023340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1858121007120).

1520321023340 is an abundant number, since it is smaller than the sum of its proper divisors (2195920990900).

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

1520321023340 is a wasteful number, since it uses less digits than its factorization.

1520321023340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966999 (or 966990 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 1520321023340 its reverse (433201230251), we get a palindrome (1953522253591).

The spelling of 1520321023340 in words is "one trillion, five hundred twenty billion, three hundred twenty-one million, twenty-three thousand, three hundred forty".