21010551441 has 12 divisors (see below), whose sum is σ = 30792323856. Its totient is φ = 12733667320.

The previous prime is 21010551439. The next prime is 21010551449. The reversal of 21010551441 is 14415501012.

It is not a de Polignac number, because 21010551441 - 2¹ = 21010551439 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21010551449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28939791 + ... + 28940516.

It is an arithmetic number, because the mean of its divisors is an integer number (2566026988).

Almost surely, 2^21010551441 is an apocalyptic number.

It is an amenable number.

21010551441 is a deficient number, since it is larger than the sum of its proper divisors (9781772415).

21010551441 is a wasteful number, since it uses less digits than its factorization.

21010551441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57880332 (or 57880321 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

The spelling of 21010551441 in words is "twenty-one billion, ten million, five hundred fifty-one thousand, four hundred forty-one".