21020344001 has 4 divisors (see below), whose sum is σ = 21083849904. Its totient is φ = 20956838100.

The previous prime is 21020343989. The next prime is 21020344027. The reversal of 21020344001 is 10044302012.

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 a cyclic number.

It is not a de Polignac number, because 21020344001 - 2¹⁴ = 21020327617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020344901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31752455 + ... + 31753116.

It is an arithmetic number, because the mean of its divisors is an integer number (5270962476).

Almost surely, 2^21020344001 is an apocalyptic number.

It is an amenable number.

21020344001 is a deficient number, since it is larger than the sum of its proper divisors (63505903).

21020344001 is an equidigital number, since it uses as much as digits as its factorization.

21020344001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63505902.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21020344001 its reverse (10044302012), we get a palindrome (31064646013).

The spelling of 21020344001 in words is "twenty-one billion, twenty million, three hundred forty-four thousand, one".