21203535122 has 16 divisors (see below), whose sum is σ = 39653364672. Its totient is φ = 8261117520.

The previous prime is 21203535097. The next prime is 21203535131. The reversal of 21203535122 is 22153530212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21203535091 and 21203535100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68842493 + ... + 68842800.

It is an arithmetic number, because the mean of its divisors is an integer number (2478335292).

Almost surely, 2^21203535122 is an apocalyptic number.

21203535122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21203535122 is a deficient number, since it is larger than the sum of its proper divisors (18449829550).

21203535122 is a wasteful number, since it uses less digits than its factorization.

21203535122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137685313.

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 21203535122 in words is "twenty-one billion, two hundred three million, five hundred thirty-five thousand, one hundred twenty-two".