21420001073 has 8 divisors (see below), whose sum is σ = 21515736000. Its totient is φ = 21324374928.

The previous prime is 21420001051. The next prime is 21420001081. The reversal of 21420001073 is 37010002412.

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 21420001073 - 2¹² = 21419996977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21420006073) 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, 381098 + ... + 433676.

It is an arithmetic number, because the mean of its divisors is an integer number (2689467000).

Almost surely, 2^21420001073 is an apocalyptic number.

It is an amenable number.

21420001073 is a deficient number, since it is larger than the sum of its proper divisors (95734927).

21420001073 is a wasteful number, since it uses less digits than its factorization.

21420001073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54391.

The product of its (nonzero) digits is 336, while the sum is 20.

Adding to 21420001073 its reverse (37010002412), we get a palindrome (58430003485).

The spelling of 21420001073 in words is "twenty-one billion, four hundred twenty million, one thousand, seventy-three".