21547644423141 has 16 divisors (see below), whose sum is σ = 29509721712000. Its totient is φ = 13975411641408.

The previous prime is 21547644423131. The next prime is 21547644423169. The reversal of 21547644423141 is 14132444674512.

It is not a de Polignac number, because 21547644423141 - 2¹⁵ = 21547644390373 is a prime.

It is a super-2 number, since 2×21547644423141² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21547644423131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8907966 + ... + 11065583.

It is an arithmetic number, because the mean of its divisors is an integer number (1844357607000).

Almost surely, 2^{21547644423141} is an apocalyptic number.

It is an amenable number.

21547644423141 is a deficient number, since it is larger than the sum of its proper divisors (7962077288859).

21547644423141 is a wasteful number, since it uses less digits than its factorization.

21547644423141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19983308.

The product of its digits is 2580480, while the sum is 48.

The spelling of 21547644423141 in words is "twenty-one trillion, five hundred forty-seven billion, six hundred forty-four million, four hundred twenty-three thousand, one hundred forty-one".