21160521331428 has 12 divisors (see below), whose sum is σ = 49374549773360. Its totient is φ = 7053507110472.

The previous prime is 21160521331427. The next prime is 21160521331471. The reversal of 21160521331428 is 82413312506112.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21160521331427) 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, 881688388798 + ... + 881688388821.

Almost surely, 2^{21160521331428} is an apocalyptic number.

It is an amenable number.

21160521331428 is an abundant number, since it is smaller than the sum of its proper divisors (28214028441932).

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

21160521331428 is a wasteful number, since it uses less digits than its factorization.

21160521331428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1763376777626 (or 1763376777624 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 21160521331428 in words is "twenty-one trillion, one hundred sixty billion, five hundred twenty-one million, three hundred thirty-one thousand, four hundred twenty-eight".