21211002122 has 16 divisors (see below), whose sum is σ = 32206201344. Its totient is φ = 10476090000.

The previous prime is 21211002103. The next prime is 21211002181. The reversal of 21211002122 is 22120011212.

It is a super-2 number, since 2×21211002122² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21211002097 and 21211002106.

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, 34754 + ... + 208877.

It is an arithmetic number, because the mean of its divisors is an integer number (2012887584).

Almost surely, 2^21211002122 is an apocalyptic number.

21211002122 is a deficient number, since it is larger than the sum of its proper divisors (10995199222).

21211002122 is a wasteful number, since it uses less digits than its factorization.

21211002122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244165.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21211002122 its reverse (22120011212), we get a palindrome (43331013334).

The spelling of 21211002122 in words is "twenty-one billion, two hundred eleven million, two thousand, one hundred twenty-two".