21036446061 has 4 divisors (see below), whose sum is σ = 28048594752. Its totient is φ = 14024297372.

The previous prime is 21036446059. The next prime is 21036446063. The reversal of 21036446061 is 16064463012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (21036446059) and next prime (21036446063).

It is a cyclic number.

It is not a de Polignac number, because 21036446061 - 2¹ = 21036446059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21036446063) 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, 3506074341 + ... + 3506074346.

It is an arithmetic number, because the mean of its divisors is an integer number (7012148688).

Almost surely, 2^21036446061 is an apocalyptic number.

It is an amenable number.

21036446061 is a deficient number, since it is larger than the sum of its proper divisors (7012148691).

21036446061 is an equidigital number, since it uses as much as digits as its factorization.

21036446061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7012148690.

The product of its (nonzero) digits is 20736, while the sum is 33.

The spelling of 21036446061 in words is "twenty-one billion, thirty-six million, four hundred forty-six thousand, sixty-one".