21639543439101 has 8 divisors (see below), whose sum is σ = 32974542383424. Its totient is φ = 12365453393760.

The previous prime is 21639543439093. The next prime is 21639543439103. The reversal of 21639543439101 is 10193434593612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21639543439101 - 2³ = 21639543439093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21639543439103) 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, 515227224720 + ... + 515227224761.

It is an arithmetic number, because the mean of its divisors is an integer number (4121817797928).

Almost surely, 2^{21639543439101} is an apocalyptic number.

21639543439101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21639543439101 is a deficient number, since it is larger than the sum of its proper divisors (11334998944323).

21639543439101 is a wasteful number, since it uses less digits than its factorization.

21639543439101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030454449491.

The product of its (nonzero) digits is 2099520, while the sum is 51.

The spelling of 21639543439101 in words is "twenty-one trillion, six hundred thirty-nine billion, five hundred forty-three million, four hundred thirty-nine thousand, one hundred one".