21161005500135 has 16 divisors (see below), whose sum is σ = 34002920431584. Its totient is φ = 11237432389632.

The previous prime is 21161005500121. The next prime is 21161005500149. The reversal of 21161005500135 is 53100550016112.

It is an interprime number because it is at equal distance from previous prime (21161005500121) and next prime (21161005500149).

It is not a de Polignac number, because 21161005500135 - 2¹⁵ = 21161005467367 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3027322042 + ... + 3027329031.

It is an arithmetic number, because the mean of its divisors is an integer number (2125182526974).

Almost surely, 2^{21161005500135} is an apocalyptic number.

21161005500135 is a deficient number, since it is larger than the sum of its proper divisors (12841914931449).

21161005500135 is a wasteful number, since it uses less digits than its factorization.

21161005500135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6054651314.

The product of its (nonzero) digits is 4500, while the sum is 30.

Adding to 21161005500135 its reverse (53100550016112), we get a palindrome (74261555516247).

The spelling of 21161005500135 in words is "twenty-one trillion, one hundred sixty-one billion, five million, five hundred thousand, one hundred thirty-five".