21200551452549 has 48 divisors (see below), whose sum is σ = 35025887355264. Its totient is φ = 12104860118400.

The previous prime is 21200551452541. The next prime is 21200551452583. The reversal of 21200551452549 is 94525415500212.

21200551452549 is a `hidden beast` number, since 2 + 1 + 2 + 0 + 0 + 5 + 51 + 4 + 52 + 549 = 666.

It is not a de Polignac number, because 21200551452549 - 2³ = 21200551452541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200551452541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 411132442 + ... + 411184004.

It is an arithmetic number, because the mean of its divisors is an integer number (729705986568).

Almost surely, 2^{21200551452549} is an apocalyptic number.

It is an amenable number.

21200551452549 is a deficient number, since it is larger than the sum of its proper divisors (13825335902715).

21200551452549 is a wasteful number, since it uses less digits than its factorization.

21200551452549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56698 (or 56695 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 45.

The spelling of 21200551452549 in words is "twenty-one trillion, two hundred billion, five hundred fifty-one million, four hundred fifty-two thousand, five hundred forty-nine".