21106753707 has 8 divisors (see below), whose sum is σ = 30307133584. Its totient is φ = 12988771488.

The previous prime is 21106753693. The next prime is 21106753721. The reversal of 21106753707 is 70735760112.

It is an interprime number because it is at equal distance from previous prime (21106753693) and next prime (21106753721).

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

It is not a de Polignac number, because 21106753707 - 2¹⁰ = 21106752683 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 541198813 = 21106753707 / (2 + 1 + 1 + 0 + 6 + 7 + 5 + 3 + 7 + 0 + 7).

It is not an unprimeable number, because it can be changed into a prime (21106753757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270599368 + ... + 270599445.

It is an arithmetic number, because the mean of its divisors is an integer number (3788391698).

Almost surely, 2^21106753707 is an apocalyptic number.

21106753707 is a deficient number, since it is larger than the sum of its proper divisors (9200379877).

21106753707 is a wasteful number, since it uses less digits than its factorization.

21106753707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541198829.

The product of its (nonzero) digits is 61740, while the sum is 39.

The spelling of 21106753707 in words is "twenty-one billion, one hundred six million, seven hundred fifty-three thousand, seven hundred seven".