21123310001 has 8 divisors (see below), whose sum is σ = 21333298560. Its totient is φ = 20914150608.

The previous prime is 21123309997. The next prime is 21123310037. The reversal of 21123310001 is 10001332112.

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 21123310001 - 2² = 21123309997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21123310301) 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, 156026 + ... + 258051.

It is an arithmetic number, because the mean of its divisors is an integer number (2666662320).

Almost surely, 2^21123310001 is an apocalyptic number.

It is an amenable number.

21123310001 is a deficient number, since it is larger than the sum of its proper divisors (209988559).

21123310001 is a wasteful number, since it uses less digits than its factorization.

21123310001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414583.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21123310001 its reverse (10001332112), we get a palindrome (31124642113).

The spelling of 21123310001 in words is "twenty-one billion, one hundred twenty-three million, three hundred ten thousand, one".