531440021421534 has 32 divisors (see below), whose sum is σ = 1063302873852960. Its totient is φ = 177076213171200.

The previous prime is 531440021421473. The next prime is 531440021421571. The reversal of 531440021421534 is 435124120044135.

It is a junction number, because it is equal to n+sod(n) for n = 531440021421492 and 531440021421501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189283494 + ... + 192070614.

It is an arithmetic number, because the mean of its divisors is an integer number (33228214807905).

Almost surely, 2^{531440021421534} is an apocalyptic number.

531440021421534 is an abundant number, since it is smaller than the sum of its proper divisors (531862852431426).

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

531440021421534 is a wasteful number, since it uses less digits than its factorization.

531440021421534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2799756.

The product of its (nonzero) digits is 230400, while the sum is 39.

Adding to 531440021421534 its reverse (435124120044135), we get a palindrome (966564141465669).

The spelling of 531440021421534 in words is "five hundred thirty-one trillion, four hundred forty billion, twenty-one million, four hundred twenty-one thousand, five hundred thirty-four".