21160521331403 has 8 divisors (see below), whose sum is σ = 21179416651008. Its totient is φ = 21141628403904.

The previous prime is 21160521331387. The next prime is 21160521331427. The reversal of 21160521331403 is 30413312506112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21160521331403 - 2⁴ = 21160521331387 is a prime.

It is a super-2 number, since 2×21160521331403² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21160521331403.

It is not an unprimeable number, because it can be changed into a prime (21160521331483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17341751 + ... + 18521807.

It is an arithmetic number, because the mean of its divisors is an integer number (2647427081376).

Almost surely, 2^{21160521331403} is an apocalyptic number.

21160521331403 is a deficient number, since it is larger than the sum of its proper divisors (18895319605).

21160521331403 is a wasteful number, since it uses less digits than its factorization.

21160521331403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196053.

The product of its (nonzero) digits is 12960, while the sum is 32.

Adding to 21160521331403 its reverse (30413312506112), we get a palindrome (51573833837515).

The spelling of 21160521331403 in words is "twenty-one trillion, one hundred sixty billion, five hundred twenty-one million, three hundred thirty-one thousand, four hundred three".