21000032123201 has 8 divisors (see below), whose sum is σ = 21684297406464. Its totient is φ = 20316194645760.

The previous prime is 21000032123159. The next prime is 21000032123293. The reversal of 21000032123201 is 10232123000012.

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 21000032123201 - 2¹⁰ = 21000032122177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21000032123201.

It is not an unprimeable number, because it can be changed into a prime (21000032129201) 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, 106851680 + ... + 107048033.

It is an arithmetic number, because the mean of its divisors is an integer number (2710537175808).

Almost surely, 2^{21000032123201} is an apocalyptic number.

It is an amenable number.

21000032123201 is a deficient number, since it is larger than the sum of its proper divisors (684265283263).

21000032123201 is a wasteful number, since it uses less digits than its factorization.

21000032123201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213902911.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21000032123201 its reverse (10232123000012), we get a palindrome (31232155123213).

The spelling of 21000032123201 in words is "twenty-one trillion, thirty-two million, one hundred twenty-three thousand, two hundred one".