1021738265641 has 4 divisors (see below), whose sum is σ = 1022235948292. Its totient is φ = 1021240582992.

The previous prime is 1021738265609. The next prime is 1021738265689. The reversal of 1021738265641 is 1465628371201.

1021738265641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 751931779600 + 269806486041 = 867140^2 + 519429^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021738265641 - 2⁵ = 1021738265609 is a prime.

It is a super-2 number, since 2×1021738265641² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021738265591 and 1021738265600.

It is not an unprimeable number, because it can be changed into a prime (1021738262641) 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, 248838246 + ... + 248842351.

It is an arithmetic number, because the mean of its divisors is an integer number (255558987073).

Almost surely, 2^{1021738265641} is an apocalyptic number.

It is an amenable number.

1021738265641 is a deficient number, since it is larger than the sum of its proper divisors (497682651).

1021738265641 is an equidigital number, since it uses as much as digits as its factorization.

1021738265641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497682650.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 1021738265641 in words is "one trillion, twenty-one billion, seven hundred thirty-eight million, two hundred sixty-five thousand, six hundred forty-one".