21115351403 has 4 divisors (see below), whose sum is σ = 21233314440. Its totient is φ = 20997388368.

The previous prime is 21115351337. The next prime is 21115351423. The reversal of 21115351403 is 30415351112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21115351403 - 2¹⁰ = 21115350379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21115351423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58981250 + ... + 58981607.

It is an arithmetic number, because the mean of its divisors is an integer number (5308328610).

Almost surely, 2^21115351403 is an apocalyptic number.

21115351403 is a deficient number, since it is larger than the sum of its proper divisors (117963037).

21115351403 is a wasteful number, since it uses less digits than its factorization.

21115351403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117963036.

The product of its (nonzero) digits is 1800, while the sum is 26.

The spelling of 21115351403 in words is "twenty-one billion, one hundred fifteen million, three hundred fifty-one thousand, four hundred three".