12958909621 has 4 divisors (see below), whose sum is σ = 14810182432. Its totient is φ = 11107636812.

The previous prime is 12958909577. The next prime is 12958909657. The reversal of 12958909621 is 12690985921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12690985921 = 127 ⋅99929023.

It is a cyclic number.

It is not a de Polignac number, because 12958909621 - 2⁹ = 12958909109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12958909121) 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, 925636395 + ... + 925636408.

It is an arithmetic number, because the mean of its divisors is an integer number (3702545608).

Almost surely, 2^12958909621 is an apocalyptic number.

It is an amenable number.

12958909621 is a deficient number, since it is larger than the sum of its proper divisors (1851272811).

12958909621 is an equidigital number, since it uses as much as digits as its factorization.

12958909621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851272810.

The product of its (nonzero) digits is 699840, while the sum is 52.

The spelling of 12958909621 in words is "twelve billion, nine hundred fifty-eight million, nine hundred nine thousand, six hundred twenty-one".