21152210342101 has 4 divisors (see below), whose sum is σ = 21236482096704. Its totient is φ = 21067938587500.

The previous prime is 21152210342099. The next prime is 21152210342113. The reversal of 21152210342101 is 10124301225112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21152210342101 - 2¹ = 21152210342099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152210342141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42135876925 + ... + 42135877426.

It is an arithmetic number, because the mean of its divisors is an integer number (5309120524176).

Almost surely, 2^{21152210342101} is an apocalyptic number.

It is an amenable number.

21152210342101 is a deficient number, since it is larger than the sum of its proper divisors (84271754603).

21152210342101 is an equidigital number, since it uses as much as digits as its factorization.

21152210342101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84271754602.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 21152210342101 its reverse (10124301225112), we get a palindrome (31276511567213).

The spelling of 21152210342101 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred ten million, three hundred forty-two thousand, one hundred one".