21202421223013 has 4 divisors (see below), whose sum is σ = 21202623662220. Its totient is φ = 21202218783808.

The previous prime is 21202421223001. The next prime is 21202421223077. The reversal of 21202421223013 is 31032212420212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 747406933729 + 20455014289284 = 864527^2 + 4522722^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202421223013 - 2⁴¹ = 19003397967461 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 (21202421229013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101062420 + ... + 101271997.

It is an arithmetic number, because the mean of its divisors is an integer number (5300655915555).

Almost surely, 2^{21202421223013} is an apocalyptic number.

It is an amenable number.

21202421223013 is a deficient number, since it is larger than the sum of its proper divisors (202439207).

21202421223013 is a wasteful number, since it uses less digits than its factorization.

21202421223013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202439206.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21202421223013 its reverse (31032212420212), we get a palindrome (52234633643225).

The spelling of 21202421223013 in words is "twenty-one trillion, two hundred two billion, four hundred twenty-one million, two hundred twenty-three thousand, thirteen".