21161155051453 has 4 divisors (see below), whose sum is σ = 21163201001568. Its totient is φ = 21159109101340.

The previous prime is 21161155051447. The next prime is 21161155051489. The reversal of 21161155051453 is 35415055116112.

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 21161155051453 - 2²¹ = 21161152954301 is a prime.

It is a super-2 number, since 2×21161155051453² (a number of 27 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 (21161155051753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1022959543 + ... + 1022980228.

It is an arithmetic number, because the mean of its divisors is an integer number (5290800250392).

Almost surely, 2^{21161155051453} is an apocalyptic number.

It is an amenable number.

21161155051453 is a deficient number, since it is larger than the sum of its proper divisors (2045950115).

21161155051453 is a wasteful number, since it uses less digits than its factorization.

21161155051453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045950114.

The product of its (nonzero) digits is 90000, while the sum is 40.

The spelling of 21161155051453 in words is "twenty-one trillion, one hundred sixty-one billion, one hundred fifty-five million, fifty-one thousand, four hundred fifty-three".