21123221010001 has 32 divisors (see below), whose sum is σ = 25046714474496. Its totient is φ = 17596269600000.

The previous prime is 21123221009977. The next prime is 21123221010029. The reversal of 21123221010001 is 10001012232112.

It is a cyclic number.

It is not a de Polignac number, because 21123221010001 - 2⁹ = 21123221009489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21123221010071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1722625 + ... + 6724126.

It is an arithmetic number, because the mean of its divisors is an integer number (782709827328).

Almost surely, 2^{21123221010001} is an apocalyptic number.

It is an amenable number.

21123221010001 is a deficient number, since it is larger than the sum of its proper divisors (3923493464495).

21123221010001 is a wasteful number, since it uses less digits than its factorization.

21123221010001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8447133.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21123221010001 its reverse (10001012232112), we get a palindrome (31124233242113).

The spelling of 21123221010001 in words is "twenty-one trillion, one hundred twenty-three billion, two hundred twenty-one million, ten thousand, one".