1520012121 has 16 divisors (see below), whose sum is σ = 2044190400. Its totient is φ = 1004609088.

The previous prime is 1520012113. The next prime is 1520012161. The reversal of 1520012121 is 1212100251.

It is not a de Polignac number, because 1520012121 - 2³ = 1520012113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1520012121.

It is not an unprimeable number, because it can be changed into a prime (1520012161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343495 + ... + 347891.

It is an arithmetic number, because the mean of its divisors is an integer number (127761900).

Almost surely, 2^1520012121 is an apocalyptic number.

It is an amenable number.

1520012121 is a deficient number, since it is larger than the sum of its proper divisors (524178279).

1520012121 is a wasteful number, since it uses less digits than its factorization.

1520012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5368.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 1520012121 is about 38987.3328274710. The cubic root of 1520012121 is about 1149.7824720256.

Adding to 1520012121 its reverse (1212100251), we get a palindrome (2732112372).

The spelling of 1520012121 in words is "one billion, five hundred twenty million, twelve thousand, one hundred twenty-one".