13421660521 has 8 divisors (see below), whose sum is σ = 13864160000. Its totient is φ = 12979757520.

The previous prime is 13421660509. The next prime is 13421660537. The reversal of 13421660521 is 12506612431.

It is a happy number.

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 13421660521 - 2⁷ = 13421660393 is a prime.

It is a super-2 number, since 2×13421660521² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13421660561) 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, 103146 + ... + 193603.

It is an arithmetic number, because the mean of its divisors is an integer number (1733020000).

Almost surely, 2^13421660521 is an apocalyptic number.

It is an amenable number.

13421660521 is a deficient number, since it is larger than the sum of its proper divisors (442499479).

13421660521 is a wasteful number, since it uses less digits than its factorization.

13421660521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298239.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 13421660521 in words is "thirteen billion, four hundred twenty-one million, six hundred sixty thousand, five hundred twenty-one".