21234113031 has 8 divisors (see below), whose sum is σ = 28314166384. Its totient is φ = 14155067520.

The previous prime is 21234113009. The next prime is 21234113083. The reversal of 21234113031 is 13031143212.

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

It is not a de Polignac number, because 21234113031 - 2⁷ = 21234112903 is a prime.

It is a super-2 number, since 2×21234113031² (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 = 21234112989 and 21234113007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234113231) 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, 201346 + ... + 288111.

It is an arithmetic number, because the mean of its divisors is an integer number (3539270798).

Almost surely, 2^21234113031 is an apocalyptic number.

21234113031 is a deficient number, since it is larger than the sum of its proper divisors (7080053353).

21234113031 is a wasteful number, since it uses less digits than its factorization.

21234113031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503921.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21234113031 its reverse (13031143212), we get a palindrome (34265256243).

The spelling of 21234113031 in words is "twenty-one billion, two hundred thirty-four million, one hundred thirteen thousand, thirty-one".