21812429520641 has 16 divisors (see below), whose sum is σ = 22088224948608. Its totient is φ = 21538683264000.

The previous prime is 21812429520601. The next prime is 21812429520643. The reversal of 21812429520641 is 14602592421812.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21812429520641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21812429520643) 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, 22111226 + ... + 23076636.

It is an arithmetic number, because the mean of its divisors is an integer number (1380514059288).

Almost surely, 2^{21812429520641} is an apocalyptic number.

It is an amenable number.

21812429520641 is a deficient number, since it is larger than the sum of its proper divisors (275795427967).

21812429520641 is a wasteful number, since it uses less digits than its factorization.

21812429520641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966472.

The product of its (nonzero) digits is 552960, while the sum is 47.

The spelling of 21812429520641 in words is "twenty-one trillion, eight hundred twelve billion, four hundred twenty-nine million, five hundred twenty thousand, six hundred forty-one".