1260135606621 has 4 divisors (see below), whose sum is σ = 1680180808832. Its totient is φ = 840090404412.

The previous prime is 1260135606617. The next prime is 1260135606629. The reversal of 1260135606621 is 1266065310621.

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 not a de Polignac number, because 1260135606621 - 2² = 1260135606617 is a prime.

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 1260135606621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1260135606629) 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, 210022601101 + ... + 210022601106.

It is an arithmetic number, because the mean of its divisors is an integer number (420045202208).

Almost surely, 2^{1260135606621} is an apocalyptic number.

It is an amenable number.

1260135606621 is a deficient number, since it is larger than the sum of its proper divisors (420045202211).

1260135606621 is an equidigital number, since it uses as much as digits as its factorization.

1260135606621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420045202210.

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 1260135606621 in words is "one trillion, two hundred sixty billion, one hundred thirty-five million, six hundred six thousand, six hundred twenty-one".