21407002063 has 8 divisors (see below), whose sum is σ = 21996603648. Its totient is φ = 20822989464.

The previous prime is 21407002049. The next prime is 21407002069. The reversal of 21407002063 is 36020070412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21407002063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21407002069) 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, 1389481 + ... + 1404802.

It is an arithmetic number, because the mean of its divisors is an integer number (2749575456).

Almost surely, 2^21407002063 is an apocalyptic number.

21407002063 is a deficient number, since it is larger than the sum of its proper divisors (589601585).

21407002063 is a wasteful number, since it uses less digits than its factorization.

21407002063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2794493.

The product of its (nonzero) digits is 2016, while the sum is 25.

Adding to 21407002063 its reverse (36020070412), we get a palindrome (57427072475).

The spelling of 21407002063 in words is "twenty-one billion, four hundred seven million, two thousand, sixty-three".