126221001520781 has 4 divisors (see below), whose sum is σ = 126550560271872. Its totient is φ = 125891442769692.

The previous prime is 126221001520777. The next prime is 126221001520811. The reversal of 126221001520781 is 187025100122621.

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.

It is a cyclic number.

It is not a de Polignac number, because 126221001520781 - 2² = 126221001520777 is a prime.

It is a super-2 number, since 2×126221001520781² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126221001528781) 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, 164779374971 + ... + 164779375736.

It is an arithmetic number, because the mean of its divisors is an integer number (31637640067968).

Almost surely, 2^{126221001520781} is an apocalyptic number.

It is an amenable number.

126221001520781 is a deficient number, since it is larger than the sum of its proper divisors (329558751091).

126221001520781 is an equidigital number, since it uses as much as digits as its factorization.

126221001520781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329558751090.

The product of its (nonzero) digits is 26880, while the sum is 38.

The spelling of 126221001520781 in words is "one hundred twenty-six trillion, two hundred twenty-one billion, one million, five hundred twenty thousand, seven hundred eighty-one".