21506730621162 has 8 divisors (see below), whose sum is σ = 43013461242336. Its totient is φ = 7168910207052.

The previous prime is 21506730621161. The next prime is 21506730621169. The reversal of 21506730621162 is 26112603760512.

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

21506730621162 is an admirable number.

It is a super-3 number, since 3×21506730621162³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21506730621161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1792227551758 + ... + 1792227551769.

It is an arithmetic number, because the mean of its divisors is an integer number (5376682655292).

Almost surely, 2^{21506730621162} is an apocalyptic number.

21506730621162 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21506730621162 is a wasteful number, since it uses less digits than its factorization.

21506730621162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584455103532.

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 21506730621162 in words is "twenty-one trillion, five hundred six billion, seven hundred thirty million, six hundred twenty-one thousand, one hundred sixty-two".