21506776712341 has 16 divisors (see below), whose sum is σ = 22802117665600. Its totient is φ = 20227783200768.

The previous prime is 21506776712339. The next prime is 21506776712363. The reversal of 21506776712341 is 14321767760512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21506776712341 - 2¹ = 21506776712339 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21506776715341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167620885 + ... + 167749141.

It is an arithmetic number, because the mean of its divisors is an integer number (1425132354100).

Almost surely, 2^{21506776712341} is an apocalyptic number.

It is an amenable number.

21506776712341 is a deficient number, since it is larger than the sum of its proper divisors (1295340953259).

21506776712341 is a wasteful number, since it uses less digits than its factorization.

21506776712341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191908.

The product of its (nonzero) digits is 2963520, while the sum is 52.

The spelling of 21506776712341 in words is "twenty-one trillion, five hundred six billion, seven hundred seventy-six million, seven hundred twelve thousand, three hundred forty-one".