1520351121420 has 144 divisors (see below), whose sum is σ = 4628880180288. Its totient is φ = 403921244160.

The previous prime is 1520351121407. The next prime is 1520351121427. The reversal of 1520351121420 is 241211530251.

It is a happy number.

1520351121420 is a `hidden beast` number, since 1 + 5 + 2 + 0 + 3 + 511 + 2 + 142 + 0 = 666.

It is a super-2 number, since 2×1520351121420² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1520351121427) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87766360 + ... + 87783680.

It is an arithmetic number, because the mean of its divisors is an integer number (32145001252).

Almost surely, 2^{1520351121420} is an apocalyptic number.

1520351121420 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 1520351121420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2314440090144).

1520351121420 is an abundant number, since it is smaller than the sum of its proper divisors (3108529058868).

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

1520351121420 is a wasteful number, since it uses less digits than its factorization.

1520351121420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19120 (or 19115 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 1520351121420 its reverse (241211530251), we get a palindrome (1761562651671).

The spelling of 1520351121420 in words is "one trillion, five hundred twenty billion, three hundred fifty-one million, one hundred twenty-one thousand, four hundred twenty".