21420021132101 has 2 divisors, whose sum is σ = 21420021132102. Its totient is φ = 21420021132100.

The previous prime is 21420021132019. The next prime is 21420021132113. The reversal of 21420021132101 is 10123112002412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13791018067876 + 7629003064225 = 3713626^2 + 2762065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21420021132101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21420021138101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710010566050 + 10710010566051.

It is an arithmetic number, because the mean of its divisors is an integer number (10710010566051).

Almost surely, 2^{21420021132101} is an apocalyptic number.

It is an amenable number.

21420021132101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21420021132101 is an equidigital number, since it uses as much as digits as its factorization.

21420021132101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21420021132101 its reverse (10123112002412), we get a palindrome (31543133134513).

The spelling of 21420021132101 in words is "twenty-one trillion, four hundred twenty billion, twenty-one million, one hundred thirty-two thousand, one hundred one".