21203111322 has 12 divisors (see below), whose sum is σ = 45940074570. Its totient is φ = 7067703768.

The previous prime is 21203111317. The next prime is 21203111339. The reversal of 21203111322 is 22311130212.

It can be written as a sum of positive squares in only one way, i.e., 18077071401 + 3126039921 = 134451^2 + 55911^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1177950629 = 21203111322 / (2 + 1 + 2 + 0 + 3 + 1 + 1 + 1 + 3 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21203111295 and 21203111304.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 588975297 + ... + 588975332.

Almost surely, 2^21203111322 is an apocalyptic number.

21203111322 is an abundant number, since it is smaller than the sum of its proper divisors (24736963248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21203111322 is a wasteful number, since it uses less digits than its factorization.

21203111322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177950637 (or 1177950634 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21203111322 its reverse (22311130212), we get a palindrome (43514241534).

The spelling of 21203111322 in words is "twenty-one billion, two hundred three million, one hundred eleven thousand, three hundred twenty-two".