21155153034500 has 24 divisors (see below), whose sum is σ = 46202854228440. Its totient is φ = 8462061213600.

The previous prime is 21155153034497. The next prime is 21155153034571. The reversal of 21155153034500 is 543035155112.

It can be written as a sum of positive squares in 4 ways, for example, as 2846184940096 + 18308968094404 = 1687064^2 + 4278898^2 .

It is a super-2 number, since 2×21155153034500² (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 7 ways as a sum of consecutive naturals, for example, 21155152535 + ... + 21155153534.

It is an arithmetic number, because the mean of its divisors is an integer number (1925118926185).

Almost surely, 2^{21155153034500} is an apocalyptic number.

21155153034500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21155153034500 is an abundant number, since it is smaller than the sum of its proper divisors (25047701193940).

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

21155153034500 is a wasteful number, since it uses less digits than its factorization.

21155153034500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42310306088 (or 42310306076 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 35.

Adding to 21155153034500 its reverse (543035155112), we get a palindrome (21698188189612).

The spelling of 21155153034500 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred fifty-three million, thirty-four thousand, five hundred".