21001542341 has 16 divisors (see below), whose sum is σ = 23138680320. Its totient is φ = 18943760640.

The previous prime is 21001542301. The next prime is 21001542343. The reversal of 21001542341 is 14324510012.

It is a cyclic number.

It is not a de Polignac number, because 21001542341 - 2¹⁴ = 21001525957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001542343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3620 + ... + 204978.

It is an arithmetic number, because the mean of its divisors is an integer number (1446167520).

Almost surely, 2^21001542341 is an apocalyptic number.

It is an amenable number.

21001542341 is a deficient number, since it is larger than the sum of its proper divisors (2137137979).

21001542341 is a wasteful number, since it uses less digits than its factorization.

21001542341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201556.

The product of its (nonzero) digits is 960, while the sum is 23.

The spelling of 21001542341 in words is "twenty-one billion, one million, five hundred forty-two thousand, three hundred forty-one".