21203022122 has 4 divisors (see below), whose sum is σ = 31804533186. Its totient is φ = 10601511060.

The previous prime is 21203022107. The next prime is 21203022131. The reversal of 21203022122 is 22122030212.

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

It can be written as a sum of positive squares in only one way, i.e., 20773745161 + 429276961 = 144131^2 + 20719^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21203022122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300755529 + ... + 5300755532.

Almost surely, 2^21203022122 is an apocalyptic number.

21203022122 is a deficient number, since it is larger than the sum of its proper divisors (10601511064).

21203022122 is a wasteful number, since it uses less digits than its factorization.

21203022122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10601511063.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21203022122 its reverse (22122030212), we get a palindrome (43325052334).

The spelling of 21203022122 in words is "twenty-one billion, two hundred three million, twenty-two thousand, one hundred twenty-two".