634011717021 has 16 divisors (see below), whose sum is σ = 882279423360. Its totient is φ = 404216584640.

The previous prime is 634011716981. The next prime is 634011717023. The reversal of 634011717021 is 120717110436.

It is a happy number.

634011717021 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 634011717021 - 2¹³ = 634011708829 is a prime.

It is a super-2 number, since 2×634011717021² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634011717023) 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, 568566 + ... + 1261463.

It is an arithmetic number, because the mean of its divisors is an integer number (55142463960).

Almost surely, 2^634011717021 is an apocalyptic number.

It is an amenable number.

634011717021 is a deficient number, since it is larger than the sum of its proper divisors (248267706339).

634011717021 is a wasteful number, since it uses less digits than its factorization.

634011717021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835076.

The product of its (nonzero) digits is 7056, while the sum is 33.

Adding to 634011717021 its reverse (120717110436), we get a palindrome (754728827457).

The spelling of 634011717021 in words is "six hundred thirty-four billion, eleven million, seven hundred seventeen thousand, twenty-one".