21415311403 has 2 divisors, whose sum is σ = 21415311404. Its totient is φ = 21415311402.

The previous prime is 21415311397. The next prime is 21415311409. The reversal of 21415311403 is 30411351412.

It is a balanced prime because it is at equal distance from previous prime (21415311397) and next prime (21415311409).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21415311403 is a prime.

It is not a weakly prime, because it can be changed into another prime (21415311409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10707655701 + 10707655702.

It is an arithmetic number, because the mean of its divisors is an integer number (10707655702).

Almost surely, 2^21415311403 is an apocalyptic number.

21415311403 is a deficient number, since it is larger than the sum of its proper divisors (1).

21415311403 is an equidigital number, since it uses as much as digits as its factorization.

21415311403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21415311403 its reverse (30411351412), we get a palindrome (51826662815).

The spelling of 21415311403 in words is "twenty-one billion, four hundred fifteen million, three hundred eleven thousand, four hundred three".