1521121340 has 24 divisors (see below), whose sum is σ = 3304506240. Its totient is φ = 587467328.

The previous prime is 1521121333. The next prime is 1521121351. The reversal of 1521121340 is 431211251.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1310732 + ... + 1311891.

It is an arithmetic number, because the mean of its divisors is an integer number (137687760).

Almost surely, 2^1521121340 is an apocalyptic number.

1521121340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1521121340 is an abundant number, since it is smaller than the sum of its proper divisors (1783384900).

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

1521121340 is a wasteful number, since it uses less digits than its factorization.

1521121340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2622661 (or 2622659 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1521121340 is about 39001.5556100010. Note that the first 3 decimals coincide. The cubic root of 1521121340 is about 1150.0620861250.

Adding to 1521121340 its reverse (431211251), we get a palindrome (1952332591).

The spelling of 1521121340 in words is "one billion, five hundred twenty-one million, one hundred twenty-one thousand, three hundred forty".