21155002552061 has 8 divisors (see below), whose sum is σ = 24227619985920. Its totient is φ = 18095003671248.

The previous prime is 21155002552039. The next prime is 21155002552133. The reversal of 21155002552061 is 16025520055112.

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

It is not a de Polignac number, because 21155002552061 - 2⁶ = 21155002551997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21155002552001) 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, 3154634666 + ... + 3154641371.

It is an arithmetic number, because the mean of its divisors is an integer number (3028452498240).

Almost surely, 2^{21155002552061} is an apocalyptic number.

It is an amenable number.

21155002552061 is a deficient number, since it is larger than the sum of its proper divisors (3072617433859).

21155002552061 is an equidigital number, since it uses as much as digits as its factorization.

21155002552061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6309276523.

The product of its (nonzero) digits is 30000, while the sum is 35.

The spelling of 21155002552061 in words is "twenty-one trillion, one hundred fifty-five billion, two million, five hundred fifty-two thousand, sixty-one".