12699855899621 has 16 divisors (see below), whose sum is σ = 13991884301376. Its totient is φ = 11430748800000.

The previous prime is 12699855899617. The next prime is 12699855899683.

12699855899621 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 12699855899621 - 2² = 12699855899617 is a prime.

It is a super-2 number, since 2×12699855899621² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12699855899021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60301061 + ... + 60511301.

It is an arithmetic number, because the mean of its divisors is an integer number (874492768836).

Almost surely, 2^{12699855899621} is an apocalyptic number.

12699855899621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12699855899621 is a deficient number, since it is larger than the sum of its proper divisors (1292028401755).

12699855899621 is a wasteful number, since it uses less digits than its factorization.

12699855899621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264724.

The product of its digits is 1511654400, while the sum is 80.

The spelling of 12699855899621 in words is "twelve trillion, six hundred ninety-nine billion, eight hundred fifty-five million, eight hundred ninety-nine thousand, six hundred twenty-one".