21310543434 has 16 divisors (see below), whose sum is σ = 42646735872. Its totient is φ = 7099239648.

The previous prime is 21310543433. The next prime is 21310543439. The reversal of 21310543434 is 43434501312.

It is a super-2 number, since 2×21310543434² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21310543433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1057899 + ... + 1077854.

It is an arithmetic number, because the mean of its divisors is an integer number (2665420992).

Almost surely, 2^21310543434 is an apocalyptic number.

21310543434 is an abundant number, since it is smaller than the sum of its proper divisors (21336192438).

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

21310543434 is a wasteful number, since it uses less digits than its factorization.

21310543434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137421.

The product of its (nonzero) digits is 17280, while the sum is 30.

The spelling of 21310543434 in words is "twenty-one billion, three hundred ten million, five hundred forty-three thousand, four hundred thirty-four".