20430521101 has 2 divisors, whose sum is σ = 20430521102. Its totient is φ = 20430521100.

The previous prime is 20430521099. The next prime is 20430521129. The reversal of 20430521101 is 10112503402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18527293225 + 1903227876 = 136115^2 + 43626^2 .

It is a cyclic number.

It is not a de Polignac number, because 20430521101 - 2¹ = 20430521099 is a prime.

Together with 20430521099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20430521401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215260550 + 10215260551.

It is an arithmetic number, because the mean of its divisors is an integer number (10215260551).

Almost surely, 2^20430521101 is an apocalyptic number.

It is an amenable number.

20430521101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20430521101 is an equidigital number, since it uses as much as digits as its factorization.

20430521101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The spelling of 20430521101 in words is "twenty billion, four hundred thirty million, five hundred twenty-one thousand, one hundred one".