21305300077 has 16 divisors (see below), whose sum is σ = 23061774400. Its totient is φ = 19613715840.

The previous prime is 21305300057. The next prime is 21305300087. The reversal of 21305300077 is 77000350312.

It is a cyclic number.

It is not a de Polignac number, because 21305300077 - 2³¹ = 19157816429 is a prime.

It is a super-2 number, since 2×21305300077² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21305300047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 551449 + ... + 588817.

It is an arithmetic number, because the mean of its divisors is an integer number (1441360900).

Almost surely, 2^21305300077 is an apocalyptic number.

It is an amenable number.

21305300077 is a deficient number, since it is larger than the sum of its proper divisors (1756474323).

21305300077 is a wasteful number, since it uses less digits than its factorization.

21305300077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38236.

The product of its (nonzero) digits is 4410, while the sum is 28.

Adding to 21305300077 its reverse (77000350312), we get a palindrome (98305650389).

The spelling of 21305300077 in words is "twenty-one billion, three hundred five million, three hundred thousand, seventy-seven".