21309673077 has 192 divisors, whose sum is σ = 43288473600. Its totient is φ = 10051292160.

The previous prime is 21309673069. The next prime is 21309673127. The reversal of 21309673077 is 77037690312.

It is not a de Polignac number, because 21309673077 - 2³ = 21309673069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21309673037) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 17423488 + ... + 17424710.

It is an arithmetic number, because the mean of its divisors is an integer number (225460800).

Almost surely, 2^21309673077 is an apocalyptic number.

21309673077 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21309673077 is an abundant number, since it is smaller than the sum of its proper divisors (21978800523).

21309673077 is a wasteful number, since it uses less digits than its factorization.

21309673077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313 (or 1290 counting only the distinct ones).

The product of its (nonzero) digits is 333396, while the sum is 45.

The spelling of 21309673077 in words is "twenty-one billion, three hundred nine million, six hundred seventy-three thousand, seventy-seven".