21812429520644 has 48 divisors (see below), whose sum is σ = 43808007309696. Its totient is φ = 9308953920000.

The previous prime is 21812429520643. The next prime is 21812429520683. The reversal of 21812429520644 is 44602592421812.

It is a junction number, because it is equal to n+sod(n) for n = 21812429520592 and 21812429520601.

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, 32850482 + ... + 33507894.

It is an arithmetic number, because the mean of its divisors is an integer number (912666818952).

Almost surely, 2^{21812429520644} is an apocalyptic number.

It is an amenable number.

21812429520644 is an abundant number, since it is smaller than the sum of its proper divisors (21995577789052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21812429520644 is a wasteful number, since it uses less digits than its factorization.

21812429520644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662396 (or 662394 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 50.

The spelling of 21812429520644 in words is "twenty-one trillion, eight hundred twelve billion, four hundred twenty-nine million, five hundred twenty thousand, six hundred forty-four".