21437442747601 has 8 divisors (see below), whose sum is σ = 21548399025384. Its totient is φ = 21326508053760.

The previous prime is 21437442747599. The next prime is 21437442747613. The reversal of 21437442747601 is 10674724473412.

It can be written as a sum of positive squares in 4 ways, for example, as 9406090294225 + 12031352453376 = 3066935^2 + 3468624^2 .

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 21437442747601 - 2¹ = 21437442747599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21437442747641) 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, 3402520 + ... + 7379161.

It is an arithmetic number, because the mean of its divisors is an integer number (2693549878173).

Almost surely, 2^{21437442747601} is an apocalyptic number.

It is an amenable number.

21437442747601 is a deficient number, since it is larger than the sum of its proper divisors (110956277783).

21437442747601 is a wasteful number, since it uses less digits than its factorization.

21437442747601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10791971.

The product of its (nonzero) digits is 6322176, while the sum is 52.

The spelling of 21437442747601 in words is "twenty-one trillion, four hundred thirty-seven billion, four hundred forty-two million, seven hundred forty-seven thousand, six hundred one".