21621212302134 has 64 divisors (see below), whose sum is σ = 43573289760000. Its totient is φ = 7152111457920.

The previous prime is 21621212302133. The next prime is 21621212302181. The reversal of 21621212302134 is 43120321212612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21621212302133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1034546817 + ... + 1034567715.

It is an arithmetic number, because the mean of its divisors is an integer number (680832652500).

Almost surely, 2^{21621212302134} is an apocalyptic number.

21621212302134 is an abundant number, since it is smaller than the sum of its proper divisors (21952077457866).

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

21621212302134 is a wasteful number, since it uses less digits than its factorization.

21621212302134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23053.

The product of its (nonzero) digits is 6912, while the sum is 30.

Adding to 21621212302134 its reverse (43120321212612), we get a palindrome (64741533514746).

The spelling of 21621212302134 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred twelve million, three hundred two thousand, one hundred thirty-four".