21203010001 has 2 divisors, whose sum is σ = 21203010002. Its totient is φ = 21203010000.

The previous prime is 21203009999. The next prime is 21203010053. The reversal of 21203010001 is 10001030212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12990300625 + 8212709376 = 113975^2 + 90624^2 .

It is a cyclic number.

It is not a de Polignac number, because 21203010001 - 2¹ = 21203009999 is a prime.

Together with 21203009999, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21203010001.

It is not a weakly prime, because it can be changed into another prime (21203010061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601505000 + 10601505001.

It is an arithmetic number, because the mean of its divisors is an integer number (10601505001).

Almost surely, 2^21203010001 is an apocalyptic number.

It is an amenable number.

21203010001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203010001 is an equidigital number, since it uses as much as digits as its factorization.

21203010001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21203010001 its reverse (10001030212), we get a palindrome (31204040213).

The spelling of 21203010001 in words is "twenty-one billion, two hundred three million, ten thousand, one".