21135200361 has 8 divisors (see below), whose sum is σ = 30742109664. Its totient is φ = 12809212320.

The previous prime is 21135200353. The next prime is 21135200369. The reversal of 21135200361 is 16300253112.

It is an interprime number because it is at equal distance from previous prime (21135200353) and next prime (21135200369).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21135200361 - 2³ = 21135200353 is a prime.

It is a super-2 number, since 2×21135200361² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21135200369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320230276 + ... + 320230341.

It is an arithmetic number, because the mean of its divisors is an integer number (3842763708).

Almost surely, 2^21135200361 is an apocalyptic number.

It is an amenable number.

21135200361 is a deficient number, since it is larger than the sum of its proper divisors (9606909303).

21135200361 is a wasteful number, since it uses less digits than its factorization.

21135200361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640460631.

The product of its (nonzero) digits is 1080, while the sum is 24.

Adding to 21135200361 its reverse (16300253112), we get a palindrome (37435453473).

The spelling of 21135200361 in words is "twenty-one billion, one hundred thirty-five million, two hundred thousand, three hundred sixty-one".