21161501463 has 32 divisors (see below), whose sum is σ = 31165770240. Its totient is φ = 12725919360.

The previous prime is 21161501437. The next prime is 21161501477. The reversal of 21161501463 is 36410516112.

It is a happy number.

It is not a de Polignac number, because 21161501463 - 2²¹ = 21159404311 is a prime.

It is a super-2 number, since 2×21161501463² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21161501463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161501483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36928 + ... + 209013.

It is an arithmetic number, because the mean of its divisors is an integer number (973930320).

Almost surely, 2^21161501463 is an apocalyptic number.

21161501463 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21161501463 is a deficient number, since it is larger than the sum of its proper divisors (10004268777).

21161501463 is a wasteful number, since it uses less digits than its factorization.

21161501463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246039.

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 21161501463 in words is "twenty-one billion, one hundred sixty-one million, five hundred one thousand, four hundred sixty-three".