10005121621 has 8 divisors (see below), whose sum is σ = 11168508384. Its totient is φ = 8884039920.

The previous prime is 10005121613. The next prime is 10005121661. The reversal of 10005121621 is 12612150001.

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

It is a cyclic number.

It is not a de Polignac number, because 10005121621 - 2³ = 10005121613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10005121661) 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, 10575766 + ... + 10576711.

It is an arithmetic number, because the mean of its divisors is an integer number (1396063548).

Almost surely, 2^10005121621 is an apocalyptic number.

10005121621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10005121621 is a deficient number, since it is larger than the sum of its proper divisors (1163386763).

10005121621 is a wasteful number, since it uses less digits than its factorization.

10005121621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21152531.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 10005121621 its reverse (12612150001), we get a palindrome (22617271622).

The spelling of 10005121621 in words is "ten billion, five million, one hundred twenty-one thousand, six hundred twenty-one".