21531400546470 has 128 divisors (see below), whose sum is σ = 52717569569280. Its totient is φ = 5627121684480.

The previous prime is 21531400546459. The next prime is 21531400546477. The reversal of 21531400546470 is 7464500413512.

It is a super-2 number, since 2×21531400546470² (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 (21531400546477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 574412349 + ... + 574449831.

It is an arithmetic number, because the mean of its divisors is an integer number (411856012260).

Almost surely, 2^{21531400546470} is an apocalyptic number.

21531400546470 is an abundant number, since it is smaller than the sum of its proper divisors (31186169022810).

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

21531400546470 is a wasteful number, since it uses less digits than its factorization.

21531400546470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39510.

The product of its (nonzero) digits is 403200, while the sum is 42.

Adding to 21531400546470 its reverse (7464500413512), we get a palindrome (28995900959982).

The spelling of 21531400546470 in words is "twenty-one trillion, five hundred thirty-one billion, four hundred million, five hundred forty-six thousand, four hundred seventy".