12621951 has 6 divisors (see below), whose sum is σ = 18231720. Its totient is φ = 8414628.

The previous prime is 12621949. The next prime is 12621967. The reversal of 12621951 is 15912621.

12621951 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12621951 - 2¹ = 12621949 is a prime.

12621951 is a modest number, since divided by 21951 gives 126 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12621901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 701211 + ... + 701228.

It is an arithmetic number, because the mean of its divisors is an integer number (3038620).

Almost surely, 2^12621951 is an apocalyptic number.

12621951 is a deficient number, since it is larger than the sum of its proper divisors (5609769).

12621951 is a wasteful number, since it uses less digits than its factorization.

12621951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402445 (or 1402442 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 12621951 is about 3552.7385211974. The cubic root of 12621951 is about 232.8317290335.

The spelling of 12621951 in words is "twelve million, six hundred twenty-one thousand, nine hundred fifty-one".