21120644202434 has 32 divisors (see below), whose sum is σ = 38368874275200. Its totient is φ = 8526416492160.

The previous prime is 21120644202397. The next prime is 21120644202439. The reversal of 21120644202434 is 43420244602112.

It is a super-2 number, since 2×21120644202434² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21120644202394 and 21120644202403.

It is not an unprimeable number, because it can be changed into a prime (21120644202439) 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, 634389344 + ... + 634422635.

It is an arithmetic number, because the mean of its divisors is an integer number (1199027321100).

Almost surely, 2^{21120644202434} is an apocalyptic number.

21120644202434 is a deficient number, since it is larger than the sum of its proper divisors (17248230072766).

21120644202434 is a wasteful number, since it uses less digits than its factorization.

21120644202434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268812058.

The product of its (nonzero) digits is 73728, while the sum is 35.

Adding to 21120644202434 its reverse (43420244602112), we get a palindrome (64540888804546).

The spelling of 21120644202434 in words is "twenty-one trillion, one hundred twenty billion, six hundred forty-four million, two hundred two thousand, four hundred thirty-four".