21073919067 has 16 divisors (see below), whose sum is σ = 31496914080. Its totient is φ = 13924947456.

The previous prime is 21073919033. The next prime is 21073919081. The reversal of 21073919067 is 76091937012.

It is not a de Polignac number, because 21073919067 - 2⁶ = 21073919003 is a prime.

It is a super-2 number, since 2×21073919067² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21073918067) 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, 3450558 + ... + 3456659.

It is an arithmetic number, because the mean of its divisors is an integer number (1968557130).

Almost surely, 2^21073919067 is an apocalyptic number.

21073919067 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21073919067 is a deficient number, since it is larger than the sum of its proper divisors (10422995013).

21073919067 is a wasteful number, since it uses less digits than its factorization.

21073919067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6907339 (or 6907333 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The spelling of 21073919067 in words is "twenty-one billion, seventy-three million, nine hundred nineteen thousand, sixty-seven".