21531230343054 has 192 divisors, whose sum is σ = 50695856640000. Its totient is φ = 6583958422272.

The previous prime is 21531230343043. The next prime is 21531230343097. The reversal of 21531230343054 is 45034303213512.

21531230343054 is a `hidden beast` number, since 2 + 1 + 5 + 31 + 230 + 343 + 0 + 54 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1206966267 + ... + 1206984105.

It is an arithmetic number, because the mean of its divisors is an integer number (264040920000).

Almost surely, 2^{21531230343054} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21531230343054, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25347928320000).

21531230343054 is an abundant number, since it is smaller than the sum of its proper divisors (29164626296946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21531230343054 is a wasteful number, since it uses less digits than its factorization.

21531230343054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18567 (or 18564 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

Adding to 21531230343054 its reverse (45034303213512), we get a palindrome (66565533556566).

The spelling of 21531230343054 in words is "twenty-one trillion, five hundred thirty-one billion, two hundred thirty million, three hundred forty-three thousand, fifty-four".