21407002071 has 32 divisors (see below), whose sum is σ = 35491642368. Its totient is φ = 11175183360.

The previous prime is 21407002069. The next prime is 21407002079. The reversal of 21407002071 is 17020070412.

It is not a de Polignac number, because 21407002071 - 2¹ = 21407002069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21407002079) 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, 377715 + ... + 430676.

It is an arithmetic number, because the mean of its divisors is an integer number (1109113824).

Almost surely, 2^21407002071 is an apocalyptic number.

21407002071 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21407002071 is a deficient number, since it is larger than the sum of its proper divisors (14084640297).

21407002071 is a wasteful number, since it uses less digits than its factorization.

21407002071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808511.

The product of its (nonzero) digits is 784, while the sum is 24.

Adding to 21407002071 its reverse (17020070412), we get a palindrome (38427072483).

The spelling of 21407002071 in words is "twenty-one billion, four hundred seven million, two thousand, seventy-one".