21124342001 has 24 divisors (see below), whose sum is σ = 25899934656. Its totient is φ = 16872595200.

The previous prime is 21124341991. The next prime is 21124342003. The reversal of 21124342001 is 10024342112.

It is not a de Polignac number, because 21124342001 - 2¹⁰ = 21124340977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21124342003) 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 23 ways as a sum of consecutive naturals, for example, 152630 + ... + 256016.

It is an arithmetic number, because the mean of its divisors is an integer number (1079163944).

Almost surely, 2^21124342001 is an apocalyptic number.

It is an amenable number.

21124342001 is a deficient number, since it is larger than the sum of its proper divisors (4775592655).

21124342001 is a wasteful number, since it uses less digits than its factorization.

21124342001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103529 (or 103512 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21124342001 its reverse (10024342112), we get a palindrome (31148684113).

The spelling of 21124342001 in words is "twenty-one billion, one hundred twenty-four million, three hundred forty-two thousand, one".