21537030001 has 2 divisors, whose sum is σ = 21537030002. Its totient is φ = 21537030000.

The previous prime is 21537029977. The next prime is 21537030049. The reversal of 21537030001 is 10003073512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18534099600 + 3002930401 = 136140^2 + 54799^2 .

It is a cyclic number.

It is not a de Polignac number, because 21537030001 - 2¹⁹ = 21536505713 is a prime.

It is a super-2 number, since 2×21537030001² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21537040001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10768515000 + 10768515001.

It is an arithmetic number, because the mean of its divisors is an integer number (10768515001).

Almost surely, 2^21537030001 is an apocalyptic number.

It is an amenable number.

21537030001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21537030001 is an equidigital number, since it uses as much as digits as its factorization.

21537030001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630, while the sum is 22.

The spelling of 21537030001 in words is "twenty-one billion, five hundred thirty-seven million, thirty thousand, one".