1420120252521 has 12 divisors (see below), whose sum is σ = 2052953893380. Its totient is φ = 945976488480.

The previous prime is 1420120252513. The next prime is 1420120252543. The reversal of 1420120252521 is 1252520210241.

1420120252521 is a `hidden beast` number, since 1 + 4 + 201 + 202 + 5 + 252 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1324893081600 + 95227170921 = 1151040^2 + 308589^2 .

It is not a de Polignac number, because 1420120252521 - 2³ = 1420120252513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1420120652521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64183870 + ... + 64205991.

It is an arithmetic number, because the mean of its divisors is an integer number (171079491115).

Almost surely, 2^{1420120252521} is an apocalyptic number.

It is an amenable number.

1420120252521 is a deficient number, since it is larger than the sum of its proper divisors (632833640859).

1420120252521 is a wasteful number, since it uses less digits than its factorization.

1420120252521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128391096 (or 128391093 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 1420120252521 its reverse (1252520210241), we get a palindrome (2672640462762).

The spelling of 1420120252521 in words is "one trillion, four hundred twenty billion, one hundred twenty million, two hundred fifty-two thousand, five hundred twenty-one".