21055710001 has 2 divisors, whose sum is σ = 21055710002. Its totient is φ = 21055710000.

The previous prime is 21055709993. The next prime is 21055710017. The reversal of 21055710001 is 10001755012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15119161600 + 5936548401 = 122960^2 + 77049^2 .

It is a cyclic number.

It is not a de Polignac number, because 21055710001 - 2³ = 21055709993 is a prime.

It is a super-2 number, since 2×21055710001² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21055710901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527855000 + 10527855001.

It is an arithmetic number, because the mean of its divisors is an integer number (10527855001).

Almost surely, 2^21055710001 is an apocalyptic number.

It is an amenable number.

21055710001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21055710001 is an equidigital number, since it uses as much as digits as its factorization.

21055710001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 350, while the sum is 22.

The spelling of 21055710001 in words is "twenty-one billion, fifty-five million, seven hundred ten thousand, one".