21510453135 has 32 divisors (see below), whose sum is σ = 35560286208. Its totient is φ = 11091749760.

The previous prime is 21510453131. The next prime is 21510453137. The reversal of 21510453135 is 53135401512.

It is not a de Polignac number, because 21510453135 - 2² = 21510453131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21510453131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 487084 + ... + 529406.

It is an arithmetic number, because the mean of its divisors is an integer number (1111258944).

Almost surely, 2^21510453135 is an apocalyptic number.

21510453135 is a deficient number, since it is larger than the sum of its proper divisors (14049833073).

21510453135 is a wasteful number, since it uses less digits than its factorization.

21510453135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43455.

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 21510453135 its reverse (53135401512), we get a palindrome (74645854647).

The spelling of 21510453135 in words is "twenty-one billion, five hundred ten million, four hundred fifty-three thousand, one hundred thirty-five".