12621851 has 4 divisors (see below), whose sum is σ = 13769304. Its totient is φ = 11474400.

The previous prime is 12621823. The next prime is 12621877. The reversal of 12621851 is 15812621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15812621 = 11 ⋅1437511.

It is a cyclic number.

It is not a de Polignac number, because 12621851 - 2⁶ = 12621787 is a prime.

It is a super-2 number, since 2×12621851² = 318622245332402, which 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 12621851.

It is not an unprimeable number, because it can be changed into a prime (12621151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 573710 + ... + 573731.

It is an arithmetic number, because the mean of its divisors is an integer number (3442326).

Almost surely, 2^12621851 is an apocalyptic number.

12621851 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12621851 is a deficient number, since it is larger than the sum of its proper divisors (1147453).

12621851 is a wasteful number, since it uses less digits than its factorization.

12621851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147452.

The product of its digits is 960, while the sum is 26.

The square root of 12621851 is about 3552.7244475191. The cubic root of 12621851 is about 232.8311141461.

It can be divided in two parts, 1262 and 1851, that added together give a palindrome (3113).

The spelling of 12621851 in words is "twelve million, six hundred twenty-one thousand, eight hundred fifty-one".