21067621071 has 16 divisors (see below), whose sum is σ = 32271126528. Its totient is φ = 11975608800.

The previous prime is 21067621063. The next prime is 21067621087. The reversal of 21067621071 is 17012676012.

It is not a de Polignac number, because 21067621071 - 2³ = 21067621063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21067621061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2622220 + ... + 2630241.

It is an arithmetic number, because the mean of its divisors is an integer number (2016945408).

Almost surely, 2^21067621071 is an apocalyptic number.

21067621071 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21067621071 is a deficient number, since it is larger than the sum of its proper divisors (11203505457).

21067621071 is a wasteful number, since it uses less digits than its factorization.

21067621071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5252662.

The product of its (nonzero) digits is 7056, while the sum is 33.

The spelling of 21067621071 in words is "twenty-one billion, sixty-seven million, six hundred twenty-one thousand, seventy-one".