21621405555141 has 32 divisors (see below), whose sum is σ = 33319727596800. Its totient is φ = 12215301880320.

The previous prime is 21621405555121. The next prime is 21621405555143. The reversal of 21621405555141 is 14155550412612.

It is not a de Polignac number, because 21621405555141 - 2¹¹ = 21621405553093 is a prime.

It is a super-3 number, since 3×21621405555141³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21621405555093 and 21621405555102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21621405555143) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 23526531 + ... + 24428271.

It is an arithmetic number, because the mean of its divisors is an integer number (1041241487400).

Almost surely, 2^{21621405555141} is an apocalyptic number.

21621405555141 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21621405555141 is a deficient number, since it is larger than the sum of its proper divisors (11698322041659).

21621405555141 is a wasteful number, since it uses less digits than its factorization.

21621405555141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914669.

The product of its (nonzero) digits is 240000, while the sum is 42.

Adding to 21621405555141 its reverse (14155550412612), we get a palindrome (35776955967753).

The spelling of 21621405555141 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred five million, five hundred fifty-five thousand, one hundred forty-one".