21554343031 has 8 divisors (see below), whose sum is σ = 23314629744. Its totient is φ = 19808664960.

The previous prime is 21554342989. The next prime is 21554343047. The reversal of 21554343031 is 13034345512.

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 21554343031 - 2⁷ = 21554342903 is a prime.

It is a super-2 number, since 2×21554343031² (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 = 21554342984 and 21554343002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554343731) 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, 3649090 + ... + 3654991.

It is an arithmetic number, because the mean of its divisors is an integer number (2914328718).

Almost surely, 2^21554343031 is an apocalyptic number.

21554343031 is a deficient number, since it is larger than the sum of its proper divisors (1760286713).

21554343031 is a wasteful number, since it uses less digits than its factorization.

21554343031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7304321.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 21554343031 its reverse (13034345512), we get a palindrome (34588688543).

The spelling of 21554343031 in words is "twenty-one billion, five hundred fifty-four million, three hundred forty-three thousand, thirty-one".