21100203124501 has 2 divisors, whose sum is σ = 21100203124502. Its totient is φ = 21100203124500.

The previous prime is 21100203124439. The next prime is 21100203124541. The reversal of 21100203124501 is 10542130200112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17315369058276 + 3784834066225 = 4161174^2 + 1945465^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100203124501 - 2⁷ = 21100203124373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100203124541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550101562250 + 10550101562251.

It is an arithmetic number, because the mean of its divisors is an integer number (10550101562251).

Almost surely, 2^{21100203124501} is an apocalyptic number.

It is an amenable number.

21100203124501 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100203124501 is an equidigital number, since it uses as much as digits as its factorization.

21100203124501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 21100203124501 its reverse (10542130200112), we get a palindrome (31642333324613).

The spelling of 21100203124501 in words is "twenty-one trillion, one hundred billion, two hundred three million, one hundred twenty-four thousand, five hundred one".