21231640209295 has 16 divisors (see below), whose sum is σ = 25489370446848. Its totient is φ = 16977711463200.

The previous prime is 21231640209281. The next prime is 21231640209313. The reversal of 21231640209295 is 59290204613212.

It is not a de Polignac number, because 21231640209295 - 2¹⁷ = 21231640078223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312807952 + ... + 312875818.

It is an arithmetic number, because the mean of its divisors is an integer number (1593085652928).

Almost surely, 2^{21231640209295} is an apocalyptic number.

21231640209295 is a deficient number, since it is larger than the sum of its proper divisors (4257730237553).

21231640209295 is a wasteful number, since it uses less digits than its factorization.

21231640209295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94950.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 21231640209295 in words is "twenty-one trillion, two hundred thirty-one billion, six hundred forty million, two hundred nine thousand, two hundred ninety-five".