21424510020101 has 4 divisors (see below), whose sum is σ = 21426163286400. Its totient is φ = 21422856753804.

The previous prime is 21424510020071. The next prime is 21424510020113. The reversal of 21424510020101 is 10102001542412.

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 21424510020101 - 2⁶ = 21424510020037 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 (21424510020161) 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, 826613711 + ... + 826639628.

It is an arithmetic number, because the mean of its divisors is an integer number (5356540821600).

Almost surely, 2^{21424510020101} is an apocalyptic number.

It is an amenable number.

21424510020101 is a deficient number, since it is larger than the sum of its proper divisors (1653266299).

21424510020101 is a wasteful number, since it uses less digits than its factorization.

21424510020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1653266298.

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 21424510020101 its reverse (10102001542412), we get a palindrome (31526511562513).

The spelling of 21424510020101 in words is "twenty-one trillion, four hundred twenty-four billion, five hundred ten million, twenty thousand, one hundred one".