13512277021 has 4 divisors (see below), whose sum is σ = 13646062044. Its totient is φ = 13378492000.

The previous prime is 13512276989. The next prime is 13512277033. The reversal of 13512277021 is 12077221531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13273574521 + 238702500 = 115211^2 + 15450^2 .

It is a cyclic number.

It is not a de Polignac number, because 13512277021 - 2⁵ = 13512276989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13512277091) 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, 66892360 + ... + 66892561.

It is an arithmetic number, because the mean of its divisors is an integer number (3411515511).

Almost surely, 2^13512277021 is an apocalyptic number.

It is an amenable number.

13512277021 is a deficient number, since it is larger than the sum of its proper divisors (133785023).

13512277021 is a wasteful number, since it uses less digits than its factorization.

13512277021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133785022.

The product of its (nonzero) digits is 5880, while the sum is 31.

Adding to 13512277021 its reverse (12077221531), we get a palindrome (25589498552).

The spelling of 13512277021 in words is "thirteen billion, five hundred twelve million, two hundred seventy-seven thousand, twenty-one".