21313133420505 has 16 divisors (see below), whose sum is σ = 34104204616704. Its totient is φ = 11365940776320.

The previous prime is 21313133420483. The next prime is 21313133420543. The reversal of 21313133420505 is 50502433131312.

It is not a de Polignac number, because 21313133420505 - 2²² = 21313129226201 is a prime.

It is a super-2 number, since 2×21313133420505² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66316516 + ... + 66637125.

It is an arithmetic number, because the mean of its divisors is an integer number (2131512788544).

Almost surely, 2^{21313133420505} is an apocalyptic number.

It is an amenable number.

21313133420505 is a deficient number, since it is larger than the sum of its proper divisors (12791071196199).

21313133420505 is a wasteful number, since it uses less digits than its factorization.

21313133420505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132964336.

The product of its (nonzero) digits is 32400, while the sum is 33.

Adding to 21313133420505 its reverse (50502433131312), we get a palindrome (71815566551817).

The spelling of 21313133420505 in words is "twenty-one trillion, three hundred thirteen billion, one hundred thirty-three million, four hundred twenty thousand, five hundred five".