21623132340377 has 8 divisors (see below), whose sum is σ = 21694460143464. Its totient is φ = 21551861444608.

The previous prime is 21623132340367. The next prime is 21623132340419. The reversal of 21623132340377 is 77304323132612.

It can be written as a sum of positive squares in 4 ways, for example, as 499374008896 + 21123758331481 = 706664^2 + 4596059^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21623132340377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21623132340367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13465568 + ... + 14985585.

It is an arithmetic number, because the mean of its divisors is an integer number (2711807517933).

Almost surely, 2^{21623132340377} is an apocalyptic number.

It is an amenable number.

21623132340377 is a deficient number, since it is larger than the sum of its proper divisors (71327803087).

21623132340377 is a wasteful number, since it uses less digits than its factorization.

21623132340377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28453659.

The product of its (nonzero) digits is 762048, while the sum is 44.

Adding to 21623132340377 its reverse (77304323132612), we get a palindrome (98927455472989).

The spelling of 21623132340377 in words is "twenty-one trillion, six hundred twenty-three billion, one hundred thirty-two million, three hundred forty thousand, three hundred seventy-seven".