21333555401 has 4 divisors (see below), whose sum is σ = 22261101312. Its totient is φ = 20406009492.

The previous prime is 21333555371. The next prime is 21333555409. The reversal of 21333555401 is 10455533312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-21333555401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21333555409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463772921 + ... + 463772966.

It is an arithmetic number, because the mean of its divisors is an integer number (5565275328).

Almost surely, 2^21333555401 is an apocalyptic number.

It is an amenable number.

21333555401 is a deficient number, since it is larger than the sum of its proper divisors (927545911).

21333555401 is an equidigital number, since it uses as much as digits as its factorization.

21333555401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927545910.

The product of its (nonzero) digits is 27000, while the sum is 32.

The spelling of 21333555401 in words is "twenty-one billion, three hundred thirty-three million, five hundred fifty-five thousand, four hundred one".