21344402001 has 32 divisors (see below), whose sum is σ = 32380794880. Its totient is φ = 12397665600.

The previous prime is 21344401999. The next prime is 21344402029. The reversal of 21344402001 is 10020444312.

It is not a de Polignac number, because 21344402001 - 2¹ = 21344401999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21344402041) 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, 147666 + ... + 253956.

It is an arithmetic number, because the mean of its divisors is an integer number (1011899840).

Almost surely, 2^21344402001 is an apocalyptic number.

It is an amenable number.

21344402001 is a deficient number, since it is larger than the sum of its proper divisors (11036392879).

21344402001 is a wasteful number, since it uses less digits than its factorization.

21344402001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106597.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21344402001 its reverse (10020444312), we get a palindrome (31364846313).

The spelling of 21344402001 in words is "twenty-one billion, three hundred forty-four million, four hundred two thousand, one".