1520454345021 has 24 divisors (see below), whose sum is σ = 2211180706176. Its totient is φ = 1006735936320.

The previous prime is 1520454344971. The next prime is 1520454345037. The reversal of 1520454345021 is 1205434540251.

1520454345021 is a `hidden beast` number, since 1 + 52 + 0 + 4 + 543 + 45 + 0 + 21 = 666.

It is not a de Polignac number, because 1520454345021 - 2¹⁰ = 1520454343997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520454345721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1822716 + ... + 2522538.

It is an arithmetic number, because the mean of its divisors is an integer number (92132529424).

Almost surely, 2^{1520454345021} is an apocalyptic number.

It is an amenable number.

1520454345021 is a deficient number, since it is larger than the sum of its proper divisors (690726361155).

1520454345021 is a wasteful number, since it uses less digits than its factorization.

1520454345021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701473 (or 701470 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

Adding to 1520454345021 its reverse (1205434540251), we get a palindrome (2725888885272).

The spelling of 1520454345021 in words is "one trillion, five hundred twenty billion, four hundred fifty-four million, three hundred forty-five thousand, twenty-one".