21333221031 has 8 divisors (see below), whose sum is σ = 28445519344. Its totient is φ = 14221535040.

The previous prime is 21333221029. The next prime is 21333221047. The reversal of 21333221031 is 13012233312.

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

It is not a de Polignac number, because 21333221031 - 2¹ = 21333221029 is a prime.

It is a super-2 number, since 2×21333221031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21333220989 and 21333221007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333221131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64456 + ... + 216381.

It is an arithmetic number, because the mean of its divisors is an integer number (3555689918).

Almost surely, 2^21333221031 is an apocalyptic number.

21333221031 is a deficient number, since it is larger than the sum of its proper divisors (7112298313).

21333221031 is a wasteful number, since it uses less digits than its factorization.

21333221031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306161.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21333221031 its reverse (13012233312), we get a palindrome (34345454343).

The spelling of 21333221031 in words is "twenty-one billion, three hundred thirty-three million, two hundred twenty-one thousand, thirty-one".