21433401320 has 16 divisors (see below), whose sum is σ = 48225153060. Its totient is φ = 8573360512.

The previous prime is 21433401313. The next prime is 21433401343. The reversal of 21433401320 is 2310433412.

It can be written as a sum of positive squares in 2 ways, for example, as 21369177124 + 64224196 = 146182^2 + 8014^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 267917477 + ... + 267917556.

Almost surely, 2^21433401320 is an apocalyptic number.

21433401320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21433401320 is an abundant number, since it is smaller than the sum of its proper divisors (26791751740).

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

21433401320 is a wasteful number, since it uses less digits than its factorization.

21433401320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535835044 (or 535835040 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21433401320 its reverse (2310433412), we get a palindrome (23743834732).

The spelling of 21433401320 in words is "twenty-one billion, four hundred thirty-three million, four hundred one thousand, three hundred twenty".