21531351030135 has 32 divisors (see below), whose sum is σ = 35184339394560. Its totient is φ = 11238677906688.

The previous prime is 21531351030131. The next prime is 21531351030187. The reversal of 21531351030135 is 53103015313512.

It is not a de Polignac number, because 21531351030135 - 2² = 21531351030131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21531351030096 and 21531351030105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21531351030131) 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, 20866906 + ... + 21874424.

It is an arithmetic number, because the mean of its divisors is an integer number (1099510606080).

Almost surely, 2^{21531351030135} is an apocalyptic number.

21531351030135 is a deficient number, since it is larger than the sum of its proper divisors (13652988364425).

21531351030135 is a wasteful number, since it uses less digits than its factorization.

21531351030135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037887.

The product of its (nonzero) digits is 20250, while the sum is 33.

Adding to 21531351030135 its reverse (53103015313512), we get a palindrome (74634366343647).

The spelling of 21531351030135 in words is "twenty-one trillion, five hundred thirty-one billion, three hundred fifty-one million, thirty thousand, one hundred thirty-five".