21533420739 has 8 divisors (see below), whose sum is σ = 28714915152. Its totient is φ = 14353770080.

The previous prime is 21533420731. The next prime is 21533420749. The reversal of 21533420739 is 93702433512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21533420739 - 2³ = 21533420731 is a prime.

It is a super-3 number, since 3×21533420739³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 21533420697 and 21533420706.

It is not an unprimeable number, because it can be changed into a prime (21533420731) 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 7 ways as a sum of consecutive naturals, for example, 433452 + ... + 480569.

It is an arithmetic number, because the mean of its divisors is an integer number (3589364394).

Almost surely, 2^21533420739 is an apocalyptic number.

21533420739 is a deficient number, since it is larger than the sum of its proper divisors (7181494413).

21533420739 is an equidigital number, since it uses as much as digits as its factorization.

21533420739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921877.

The product of its (nonzero) digits is 136080, while the sum is 39.

The spelling of 21533420739 in words is "twenty-one billion, five hundred thirty-three million, four hundred twenty thousand, seven hundred thirty-nine".