21601430536246 has 16 divisors (see below), whose sum is σ = 35347909720320. Its totient is φ = 9818800312680.

The previous prime is 21601430536237. The next prime is 21601430536291. The reversal of 21601430536246 is 64263503410612.

It is a happy number.

It is a super-2 number, since 2×21601430536246² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6225415 + ... + 9053101.

It is an arithmetic number, because the mean of its divisors is an integer number (2209244357520).

Almost surely, 2^{21601430536246} is an apocalyptic number.

21601430536246 is a deficient number, since it is larger than the sum of its proper divisors (13746479184074).

21601430536246 is a wasteful number, since it uses less digits than its factorization.

21601430536246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3174939.

The product of its (nonzero) digits is 622080, while the sum is 43.

Adding to 21601430536246 its reverse (64263503410612), we get a palindrome (85864933946858).

The spelling of 21601430536246 in words is "twenty-one trillion, six hundred one billion, four hundred thirty million, five hundred thirty-six thousand, two hundred forty-six".