1261332048021 has 32 divisors (see below), whose sum is σ = 1792885536768. Its totient is φ = 787075185600.

The previous prime is 1261332048017. The next prime is 1261332048047. The reversal of 1261332048021 is 1208402331621.

It is not a de Polignac number, because 1261332048021 - 2² = 1261332048017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261332048121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 205366 + ... + 1601511.

It is an arithmetic number, because the mean of its divisors is an integer number (56027673024).

Almost surely, 2^{1261332048021} is an apocalyptic number.

It is an amenable number.

1261332048021 is a deficient number, since it is larger than the sum of its proper divisors (531553488747).

1261332048021 is a wasteful number, since it uses less digits than its factorization.

1261332048021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1807121.

The product of its (nonzero) digits is 13824, while the sum is 33.

Adding to 1261332048021 its reverse (1208402331621), we get a palindrome (2469734379642).

The spelling of 1261332048021 in words is "one trillion, two hundred sixty-one billion, three hundred thirty-two million, forty-eight thousand, twenty-one".