12621897501242 has 4 divisors (see below), whose sum is σ = 18932846251866. Its totient is φ = 6310948750620.

The previous prime is 12621897501233. The next prime is 12621897501277. The reversal of 12621897501242 is 24210579812621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11501790662041 + 1120106839201 = 3391429^2 + 1058351^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3155474375309 + ... + 3155474375312.

Almost surely, 2^{12621897501242} is an apocalyptic number.

12621897501242 is a deficient number, since it is larger than the sum of its proper divisors (6310948750624).

12621897501242 is an equidigital number, since it uses as much as digits as its factorization.

12621897501242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6310948750623.

The product of its (nonzero) digits is 967680, while the sum is 50.

The spelling of 12621897501242 in words is "twelve trillion, six hundred twenty-one billion, eight hundred ninety-seven million, five hundred one thousand, two hundred forty-two".