21345452541 has 48 divisors (see below), whose sum is σ = 35696868480. Its totient is φ = 12038492160.

The previous prime is 21345452449. The next prime is 21345452543. The reversal of 21345452541 is 14525454312.

21345452541 is a `hidden beast` number, since 2 + 13 + 4 + 54 + 52 + 541 = 666.

It is not a de Polignac number, because 21345452541 - 2¹⁴ = 21345436157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21345452496 and 21345452505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345452543) 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 47 ways as a sum of consecutive naturals, for example, 9876501 + ... + 9878661.

It is an arithmetic number, because the mean of its divisors is an integer number (743684760).

Almost surely, 2^21345452541 is an apocalyptic number.

21345452541 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21345452541 is a deficient number, since it is larger than the sum of its proper divisors (14351415939).

21345452541 is a wasteful number, since it uses less digits than its factorization.

21345452541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4146 (or 4143 counting only the distinct ones).

The product of its digits is 96000, while the sum is 36.

The spelling of 21345452541 in words is "twenty-one billion, three hundred forty-five million, four hundred fifty-two thousand, five hundred forty-one".