21506072027375 has 32 divisors (see below), whose sum is σ = 29098148788800. Its totient is φ = 15774820233600.

The previous prime is 21506072027359. The next prime is 21506072027393. The reversal of 21506072027375 is 57372027060512.

It is not a de Polignac number, because 21506072027375 - 2⁴ = 21506072027359 is a prime.

It is a super-2 number, since 2×21506072027375² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44168969 + ... + 44653218.

It is an arithmetic number, because the mean of its divisors is an integer number (909317149650).

Almost surely, 2^{21506072027375} is an apocalyptic number.

21506072027375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21506072027375 is a deficient number, since it is larger than the sum of its proper divisors (7592076761425).

21506072027375 is a wasteful number, since it uses less digits than its factorization.

21506072027375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88822364 (or 88822354 counting only the distinct ones).

The product of its (nonzero) digits is 1234800, while the sum is 47.

Adding to 21506072027375 its reverse (57372027060512), we get a palindrome (78878099087887).

The spelling of 21506072027375 in words is "twenty-one trillion, five hundred six billion, seventy-two million, twenty-seven thousand, three hundred seventy-five".