21112031455 has 8 divisors (see below), whose sum is σ = 25338976992. Its totient is φ = 16886599008.

The previous prime is 21112031411. The next prime is 21112031459. The reversal of 21112031455 is 55413021112.

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 21112031455 - 2¹³ = 21112023263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112031459) 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, 347344 + ... + 403573.

It is an arithmetic number, because the mean of its divisors is an integer number (3167372124).

Almost surely, 2^21112031455 is an apocalyptic number.

21112031455 is a deficient number, since it is larger than the sum of its proper divisors (4226945537).

21112031455 is an equidigital number, since it uses as much as digits as its factorization.

21112031455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756545.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 21112031455 its reverse (55413021112), we get a palindrome (76525052567).

The spelling of 21112031455 in words is "twenty-one billion, one hundred twelve million, thirty-one thousand, four hundred fifty-five".