1521140020 has 12 divisors (see below), whose sum is σ = 3194394084. Its totient is φ = 608456000.

The previous prime is 1521140011. The next prime is 1521140021. The reversal of 1521140020 is 200411251.

It can be written as a sum of positive squares in 2 ways, for example, as 1126005136 + 395134884 = 33556^2 + 19878^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1521139976 and 1521140003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521140021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38028481 + ... + 38028520.

It is an arithmetic number, because the mean of its divisors is an integer number (266199507).

Almost surely, 2^1521140020 is an apocalyptic number.

1521140020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1521140020 is an abundant number, since it is smaller than the sum of its proper divisors (1673254064).

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

1521140020 is a wasteful number, since it uses less digits than its factorization.

1521140020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76057010 (or 76057008 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1521140020 is about 39001.7950868931. The cubic root of 1521140020 is about 1150.0667938520.

Adding to 1521140020 its reverse (200411251), we get a palindrome (1721551271).

The spelling of 1521140020 in words is "one billion, five hundred twenty-one million, one hundred forty thousand, twenty".