21030344121 has 8 divisors (see below), whose sum is σ = 28041685504. Its totient is φ = 14019616080.

The previous prime is 21030344119. The next prime is 21030344171. The reversal of 21030344121 is 12144303012.

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

It is not a de Polignac number, because 21030344121 - 2¹ = 21030344119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21030344171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66265 + ... + 215526.

It is an arithmetic number, because the mean of its divisors is an integer number (3505210688).

Almost surely, 2^21030344121 is an apocalyptic number.

It is an amenable number.

21030344121 is a deficient number, since it is larger than the sum of its proper divisors (7011341383).

21030344121 is a wasteful number, since it uses less digits than its factorization.

21030344121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306671.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21030344121 its reverse (12144303012), we get a palindrome (33174647133).

The spelling of 21030344121 in words is "twenty-one billion, thirty million, three hundred forty-four thousand, one hundred twenty-one".