21450000101 has 2 divisors, whose sum is σ = 21450000102. Its totient is φ = 21450000100.

The previous prime is 21450000079. The next prime is 21450000109. The reversal of 21450000101 is 10100005412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17226300001 + 4223700100 = 131249^2 + 64990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21450000101 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21450000109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725000050 + 10725000051.

It is an arithmetic number, because the mean of its divisors is an integer number (10725000051).

Almost surely, 2^21450000101 is an apocalyptic number.

It is an amenable number.

21450000101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21450000101 is an equidigital number, since it uses as much as digits as its factorization.

21450000101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 14.

Adding to 21450000101 its reverse (10100005412), we get a palindrome (31550005513).

The spelling of 21450000101 in words is "twenty-one billion, four hundred fifty million, one hundred one", and thus it is an aban number.