21110070077 has 8 divisors (see below), whose sum is σ = 21576240216. Its totient is φ = 20646413632.

The previous prime is 21110070053. The next prime is 21110070089. The reversal of 21110070077 is 77007001112.

It can be written as a sum of positive squares in 4 ways, for example, as 421850521 + 20688219556 = 20539^2 + 143834^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21110070077 - 2¹⁸ = 21109807933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110030077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611438 + ... + 645039.

It is an arithmetic number, because the mean of its divisors is an integer number (2697030027).

Almost surely, 2^21110070077 is an apocalyptic number.

It is an amenable number.

21110070077 is a deficient number, since it is larger than the sum of its proper divisors (466170139).

21110070077 is a wasteful number, since it uses less digits than its factorization.

21110070077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256847.

The product of its (nonzero) digits is 686, while the sum is 26.

Adding to 21110070077 its reverse (77007001112), we get a palindrome (98117071189).

The spelling of 21110070077 in words is "twenty-one billion, one hundred ten million, seventy thousand, seventy-seven".