21224345402001 has 16 divisors (see below), whose sum is σ = 32644120034304. Its totient is φ = 12014849732304.

The previous prime is 21224345401981. The next prime is 21224345402053. The reversal of 21224345402001 is 10020454342212.

It is a happy number.

It is not a de Polignac number, because 21224345402001 - 2¹⁸ = 21224345139857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21224345402001.

It is not an unprimeable number, because it can be changed into a prime (21224345402101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4722816045 + ... + 4722820538.

It is an arithmetic number, because the mean of its divisors is an integer number (2040257502144).

Almost surely, 2^{21224345402001} is an apocalyptic number.

21224345402001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21224345402001 is a deficient number, since it is larger than the sum of its proper divisors (11419774632303).

21224345402001 is a wasteful number, since it uses less digits than its factorization.

21224345402001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9445636700.

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 21224345402001 its reverse (10020454342212), we get a palindrome (31244799744213).

The spelling of 21224345402001 in words is "twenty-one trillion, two hundred twenty-four billion, three hundred forty-five million, four hundred two thousand, one".