21203121022 has 16 divisors (see below), whose sum is σ = 33481670400. Its totient is φ = 10042666200.

The previous prime is 21203121019. The next prime is 21203121061. The reversal of 21203121022 is 22012130212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21203120987 and 21203121005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 587397 + ... + 622447.

It is an arithmetic number, because the mean of its divisors is an integer number (2092604400).

Almost surely, 2^21203121022 is an apocalyptic number.

21203121022 is a deficient number, since it is larger than the sum of its proper divisors (12278549378).

21203121022 is a wasteful number, since it uses less digits than its factorization.

21203121022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50991.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21203121022 its reverse (22012130212), we get a palindrome (43215251234).

The spelling of 21203121022 in words is "twenty-one billion, two hundred three million, one hundred twenty-one thousand, twenty-two".