21265053797346 has 16 divisors (see below), whose sum is σ = 43519179864864. Its totient is φ = 6923505887424.

The previous prime is 21265053797257. The next prime is 21265053797359. The reversal of 21265053797346 is 64379735056212.

It is a super-3 number, since 3×21265053797346³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21265053797346.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41211344311 + ... + 41211344826.

It is an arithmetic number, because the mean of its divisors is an integer number (2719948741554).

Almost surely, 2^{21265053797346} is an apocalyptic number.

21265053797346 is an abundant number, since it is smaller than the sum of its proper divisors (22254126067518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21265053797346 is a wasteful number, since it uses less digits than its factorization.

21265053797346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82422689185.

The product of its (nonzero) digits is 57153600, while the sum is 60.

The spelling of 21265053797346 in words is "twenty-one trillion, two hundred sixty-five billion, fifty-three million, seven hundred ninety-seven thousand, three hundred forty-six".