21461216863 has 2 divisors, whose sum is σ = 21461216864. Its totient is φ = 21461216862.

The previous prime is 21461216831. The next prime is 21461216977. The reversal of 21461216863 is 36861216412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21461216863 - 2⁵ = 21461216831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21461216263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10730608431 + 10730608432.

It is an arithmetic number, because the mean of its divisors is an integer number (10730608432).

Almost surely, 2^21461216863 is an apocalyptic number.

21461216863 is a deficient number, since it is larger than the sum of its proper divisors (1).

21461216863 is an equidigital number, since it uses as much as digits as its factorization.

21461216863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 40.

The spelling of 21461216863 in words is "twenty-one billion, four hundred sixty-one million, two hundred sixteen thousand, eight hundred sixty-three".