21506741127542 has 16 divisors (see below), whose sum is σ = 35193183625152. Its totient is φ = 9775698502920.

The previous prime is 21506741127533. The next prime is 21506741127631. The reversal of 21506741127542 is 24572114760512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2251328 + ... + 6934115.

It is an arithmetic number, because the mean of its divisors is an integer number (2199573976572).

Almost surely, 2^{21506741127542} is an apocalyptic number.

21506741127542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21506741127542 is a deficient number, since it is larger than the sum of its proper divisors (13686442497610).

21506741127542 is a wasteful number, since it uses less digits than its factorization.

21506741127542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9291883.

The product of its (nonzero) digits is 940800, while the sum is 47.

The spelling of 21506741127542 in words is "twenty-one trillion, five hundred six billion, seven hundred forty-one million, one hundred twenty-seven thousand, five hundred forty-two".