7705706421 has 16 divisors (see below), whose sum is σ = 11745204224. Its totient is φ = 4402070064.

The previous prime is 7705706413. The next prime is 7705706429. The reversal of 7705706421 is 1246075077.

It is an interprime number because it is at equal distance from previous prime (7705706413) and next prime (7705706429).

It is not a de Polignac number, because 7705706421 - 2³ = 7705706413 is a prime.

It is a super-2 number, since 2×7705706421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7705706421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7705706429) 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, 33096 + ... + 128478.

It is an arithmetic number, because the mean of its divisors is an integer number (734075264).

Almost surely, 2^7705706421 is an apocalyptic number.

It is an amenable number.

7705706421 is a deficient number, since it is larger than the sum of its proper divisors (4039497803).

7705706421 is a wasteful number, since it uses less digits than its factorization.

7705706421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99240.

The product of its (nonzero) digits is 82320, while the sum is 39.

The square root of 7705706421 is about 87782.1532032565. The cubic root of 7705706421 is about 1975.1685095553.

The spelling of 7705706421 in words is "seven billion, seven hundred five million, seven hundred six thousand, four hundred twenty-one".