21000510132542 has 16 divisors (see below), whose sum is σ = 31539940185600. Its totient is φ = 10487197612248.

The previous prime is 21000510132527. The next prime is 21000510132557. The reversal of 21000510132542 is 24523101500012.

It is an interprime number because it is at equal distance from previous prime (21000510132527) and next prime (21000510132557).

It is a congruent number.

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, 51612209 + ... + 52017507.

It is an arithmetic number, because the mean of its divisors is an integer number (1971246261600).

Almost surely, 2^{21000510132542} is an apocalyptic number.

21000510132542 is a deficient number, since it is larger than the sum of its proper divisors (10539430053058).

21000510132542 is a wasteful number, since it uses less digits than its factorization.

21000510132542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437455.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21000510132542 its reverse (24523101500012), we get a palindrome (45523611632554).

The spelling of 21000510132542 in words is "twenty-one trillion, five hundred ten million, one hundred thirty-two thousand, five hundred forty-two".