21242254101 has 8 divisors (see below), whose sum is σ = 28430698560. Its totient is φ = 14107656192.

The previous prime is 21242254081. The next prime is 21242254127. The reversal of 21242254101 is 10145224212.

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

It is not a de Polignac number, because 21242254101 - 2¹⁴ = 21242237717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242204101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13460716 + ... + 13462293.

It is an arithmetic number, because the mean of its divisors is an integer number (3553837320).

Almost surely, 2^21242254101 is an apocalyptic number.

It is an amenable number.

21242254101 is a deficient number, since it is larger than the sum of its proper divisors (7188444459).

21242254101 is a wasteful number, since it uses less digits than its factorization.

21242254101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26923275.

The product of its (nonzero) digits is 1280, while the sum is 24.

Adding to 21242254101 its reverse (10145224212), we get a palindrome (31387478313).

The spelling of 21242254101 in words is "twenty-one billion, two hundred forty-two million, two hundred fifty-four thousand, one hundred one".