21202231131421 has 8 divisors (see below), whose sum is σ = 21212801040384. Its totient is φ = 21191661857520.

The previous prime is 21202231131397. The next prime is 21202231131449. The reversal of 21202231131421 is 12413113220212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21202231131421 - 2⁹ = 21202231130909 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 (21202231131721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75565731 + ... + 75845791.

It is an arithmetic number, because the mean of its divisors is an integer number (2651600130048).

Almost surely, 2^{21202231131421} is an apocalyptic number.

It is an amenable number.

21202231131421 is a deficient number, since it is larger than the sum of its proper divisors (10569908963).

21202231131421 is a wasteful number, since it uses less digits than its factorization.

21202231131421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317531.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 21202231131421 its reverse (12413113220212), we get a palindrome (33615344351633).

The spelling of 21202231131421 in words is "twenty-one trillion, two hundred two billion, two hundred thirty-one million, one hundred thirty-one thousand, four hundred twenty-one".