6921107512755 has 32 divisors (see below), whose sum is σ = 11078113746240. Its totient is φ = 3689810472960.

The previous prime is 6921107512727. The next prime is 6921107512783. The reversal of 6921107512755 is 5572157011296.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6921107512727) and next prime (6921107512783).

It is not a de Polignac number, because 6921107512755 - 2⁸ = 6921107512499 is a prime.

It is a super-2 number, since 2×6921107512755² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6921107512698 and 6921107512707.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 733707519 + ... + 733716951.

It is an arithmetic number, because the mean of its divisors is an integer number (346191054570).

Almost surely, 2^{6921107512755} is an apocalyptic number.

6921107512755 is a deficient number, since it is larger than the sum of its proper divisors (4157006233485).

6921107512755 is a wasteful number, since it uses less digits than its factorization.

6921107512755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23431.

The product of its (nonzero) digits is 1323000, while the sum is 51.

The spelling of 6921107512755 in words is "six trillion, nine hundred twenty-one billion, one hundred seven million, five hundred twelve thousand, seven hundred fifty-five".