21231286093 has 2 divisors, whose sum is σ = 21231286094. Its totient is φ = 21231286092.

The previous prime is 21231286079. The next prime is 21231286117. The reversal of 21231286093 is 39068213212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21056041449 + 175244644 = 145107^2 + 13238^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21231286093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21231286003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615643046 + 10615643047.

It is an arithmetic number, because the mean of its divisors is an integer number (10615643047).

Almost surely, 2^21231286093 is an apocalyptic number.

It is an amenable number.

21231286093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231286093 is an equidigital number, since it uses as much as digits as its factorization.

21231286093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 21231286093 in words is "twenty-one billion, two hundred thirty-one million, two hundred eighty-six thousand, ninety-three".