12690621 has 16 divisors (see below), whose sum is σ = 18861120. Its totient is φ = 8433360.

The previous prime is 12690589. The next prime is 12690637. The reversal of 12690621 is 12609621.

12690621 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12690621 - 2⁵ = 12690589 is a prime.

It is a super-2 number, since 2×12690621² = 322103722731282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12690121) 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, 11431 + ... + 12491.

It is an arithmetic number, because the mean of its divisors is an integer number (1178820).

Almost surely, 2^12690621 is an apocalyptic number.

It is an amenable number.

12690621 is a deficient number, since it is larger than the sum of its proper divisors (6170499).

12690621 is a wasteful number, since it uses less digits than its factorization.

12690621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513 (or 1507 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 12690621 is about 3562.3897877689. The cubic root of 12690621 is about 233.2532076357.

The spelling of 12690621 in words is "twelve million, six hundred ninety thousand, six hundred twenty-one".