21102123001 has 8 divisors (see below), whose sum is σ = 22353524424. Its totient is φ = 19851843840.

The previous prime is 21102122983. The next prime is 21102123019. The reversal of 21102123001 is 10032120112.

It is an interprime number because it is at equal distance from previous prime (21102122983) and next prime (21102123019).

It can be written as a sum of positive squares in 4 ways, for example, as 1892163001 + 19209960000 = 43499^2 + 138600^2 .

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

It is not a de Polignac number, because 21102123001 - 2¹³ = 21102114809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102123401) 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, 241690 + ... + 317203.

It is an arithmetic number, because the mean of its divisors is an integer number (2794190553).

Almost surely, 2^21102123001 is an apocalyptic number.

It is an amenable number.

21102123001 is a deficient number, since it is larger than the sum of its proper divisors (1251401423).

21102123001 is a wasteful number, since it uses less digits than its factorization.

21102123001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561131.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21102123001 its reverse (10032120112), we get a palindrome (31134243113).

The spelling of 21102123001 in words is "twenty-one billion, one hundred two million, one hundred twenty-three thousand, one".