21531543143045 has 32 divisors (see below), whose sum is σ = 27873974403072. Its totient is φ = 15872453597952.

The previous prime is 21531543143027. The next prime is 21531543143063. The reversal of 21531543143045 is 54034134513512.

It is an interprime number because it is at equal distance from previous prime (21531543143027) and next prime (21531543143063).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21531543143045 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21531543142993 and 21531543143011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 416872412 + ... + 416924058.

It is an arithmetic number, because the mean of its divisors is an integer number (871061700096).

Almost surely, 2^{21531543143045} is an apocalyptic number.

It is an amenable number.

21531543143045 is a deficient number, since it is larger than the sum of its proper divisors (6342431260027).

21531543143045 is a wasteful number, since it uses less digits than its factorization.

21531543143045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62741.

The product of its (nonzero) digits is 432000, while the sum is 41.

Adding to 21531543143045 its reverse (54034134513512), we get a palindrome (75565677656557).

The spelling of 21531543143045 in words is "twenty-one trillion, five hundred thirty-one billion, five hundred forty-three million, one hundred forty-three thousand, forty-five".