21203343035 has 16 divisors (see below), whose sum is σ = 29085241536. Its totient is φ = 14536249728.

The previous prime is 21203343023. The next prime is 21203343053. The reversal of 21203343035 is 53034330212.

It is a happy number.

It is not a de Polignac number, because 21203343035 - 2⁴ = 21203343019 is a prime.

It is a super-2 number, since 2×21203343035² (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 = 21203342995 and 21203343013.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101657 + ... + 229653.

It is an arithmetic number, because the mean of its divisors is an integer number (1817827596).

Almost surely, 2^21203343035 is an apocalyptic number.

21203343035 is a deficient number, since it is larger than the sum of its proper divisors (7881898501).

21203343035 is a wasteful number, since it uses less digits than its factorization.

21203343035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132742.

The product of its (nonzero) digits is 6480, while the sum is 26.

Adding to 21203343035 its reverse (53034330212), we get a palindrome (74237673247).

The spelling of 21203343035 in words is "twenty-one billion, two hundred three million, three hundred forty-three thousand, thirty-five".