105611000021 has 8 divisors (see below), whose sum is σ = 106897848960. Its totient is φ = 104324494752.

The previous prime is 105610999969. The next prime is 105611000029. The reversal of 105611000021 is 120000116501.

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

It is a cyclic number.

It is not a de Polignac number, because 105611000021 - 2⁶ = 105610999957 is a prime.

It is a super-2 number, since 2×105611000021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105611000029) 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, 562001 + ... + 725993.

It is an arithmetic number, because the mean of its divisors is an integer number (13362231120).

Almost surely, 2^105611000021 is an apocalyptic number.

It is an amenable number.

105611000021 is a deficient number, since it is larger than the sum of its proper divisors (1286848939).

105611000021 is an equidigital number, since it uses as much as digits as its factorization.

105611000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171835.

The product of its (nonzero) digits is 60, while the sum is 17.

Adding to 105611000021 its reverse (120000116501), we get a palindrome (225611116522).

The spelling of 105611000021 in words is "one hundred five billion, six hundred eleven million, twenty-one", and thus it is an aban number.