21515554313104 has 20 divisors (see below), whose sum is σ = 41686488532864. Its totient is φ = 10757750820768.

The previous prime is 21515554313083. The next prime is 21515554313107. The reversal of 21515554313104 is 40131345551512.

It is a super-2 number, since 2×21515554313104² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21515554313107) 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 3 ways as a sum of consecutive naturals, for example, 6238489 + ... + 9052615.

Almost surely, 2^{21515554313104} is an apocalyptic number.

It is an amenable number.

21515554313104 is a deficient number, since it is larger than the sum of its proper divisors (20170934219760).

21515554313104 is a wasteful number, since it uses less digits than its factorization.

21515554313104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3291982 (or 3291976 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 40.

Adding to 21515554313104 its reverse (40131345551512), we get a palindrome (61646899864616).

The spelling of 21515554313104 in words is "twenty-one trillion, five hundred fifteen billion, five hundred fifty-four million, three hundred thirteen thousand, one hundred four".