21623044637130 has 32 divisors (see below), whose sum is σ = 51896962579968. Its totient is φ = 5765961297600.

The previous prime is 21623044637063. The next prime is 21623044637177. The reversal of 21623044637130 is 3173644032612.

It is a happy number.

It is a super-3 number, since 3×21623044637130³ (a number of 41 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 10538761 + ... + 12422220.

It is an arithmetic number, because the mean of its divisors is an integer number (1621780080624).

Almost surely, 2^{21623044637130} is an apocalyptic number.

21623044637130 is an abundant number, since it is smaller than the sum of its proper divisors (30273917942838).

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

21623044637130 is a wasteful number, since it uses less digits than its factorization.

21623044637130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22992382.

The product of its (nonzero) digits is 435456, while the sum is 42.

Adding to 21623044637130 its reverse (3173644032612), we get a palindrome (24796688669742).

The spelling of 21623044637130 in words is "twenty-one trillion, six hundred twenty-three billion, forty-four million, six hundred thirty-seven thousand, one hundred thirty".