21033211324431 has 8 divisors (see below), whose sum is σ = 28088032598064. Its totient is φ = 14000265466880.

The previous prime is 21033211324409. The next prime is 21033211324511. The reversal of 21033211324431 is 13442311233012.

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 21033211324431 - 2⁵ = 21033211324399 is a prime.

It is a super-2 number, since 2×21033211324431² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033211323431) 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, 5468851776 + ... + 5468855621.

It is an arithmetic number, because the mean of its divisors is an integer number (3511004074758).

Almost surely, 2^{21033211324431} is an apocalyptic number.

21033211324431 is a deficient number, since it is larger than the sum of its proper divisors (7054821273633).

21033211324431 is a wasteful number, since it uses less digits than its factorization.

21033211324431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10937708041.

The product of its (nonzero) digits is 10368, while the sum is 30.

Adding to 21033211324431 its reverse (13442311233012), we get a palindrome (34475522557443).

The spelling of 21033211324431 in words is "twenty-one trillion, thirty-three billion, two hundred eleven million, three hundred twenty-four thousand, four hundred thirty-one".