6917429621 has 4 divisors (see below), whose sum is σ = 7140572544. Its totient is φ = 6694286700.

The previous prime is 6917429593. The next prime is 6917429639. The reversal of 6917429621 is 1269247196.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6917429621 is a prime.

It is a super-2 number, since 2×6917429621² = 95701665122976407282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6917429641) 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 3 ways as a sum of consecutive naturals, for example, 111571415 + ... + 111571476.

It is an arithmetic number, because the mean of its divisors is an integer number (1785143136).

Almost surely, 2^6917429621 is an apocalyptic number.

It is an amenable number.

6917429621 is a deficient number, since it is larger than the sum of its proper divisors (223142923).

6917429621 is a wasteful number, since it uses less digits than its factorization.

6917429621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223142922.

The product of its digits is 326592, while the sum is 47.

The square root of 6917429621 is about 83171.0864483566. The cubic root of 6917429621 is about 1905.3799157317.

The spelling of 6917429621 in words is "six billion, nine hundred seventeen million, four hundred twenty-nine thousand, six hundred twenty-one".