21000202122 has 16 divisors (see below), whose sum is σ = 42041633760. Its totient is φ = 6993195792.

The previous prime is 21000202087. The next prime is 21000202133. The reversal of 21000202122 is 22120200012.

It is a junction number, because it is equal to n+sod(n) for n = 21000202098 and 21000202107.

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 in 7 ways as a sum of consecutive naturals, for example, 1711273 + ... + 1723500.

It is an arithmetic number, because the mean of its divisors is an integer number (2627602110).

Almost surely, 2^21000202122 is an apocalyptic number.

21000202122 is an abundant number, since it is smaller than the sum of its proper divisors (21041431638).

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

21000202122 is a wasteful number, since it uses less digits than its factorization.

21000202122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3435797.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21000202122 its reverse (22120200012), we get a palindrome (43120402134).

The spelling of 21000202122 in words is "twenty-one billion, two hundred two thousand, one hundred twenty-two".