21211010122 has 8 divisors (see below), whose sum is σ = 31845002436. Its totient is φ = 10596009312.

The previous prime is 21211010099. The next prime is 21211010129. The reversal of 21211010122 is 22101011212.

It can be written as a sum of positive squares in 2 ways, for example, as 18114198921 + 3096811201 = 134589^2 + 55649^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21211010129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4745083 + ... + 4749550.

Almost surely, 2^21211010122 is an apocalyptic number.

21211010122 is a deficient number, since it is larger than the sum of its proper divisors (10633992314).

21211010122 is a wasteful number, since it uses less digits than its factorization.

21211010122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9495752.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21211010122 its reverse (22101011212), we get a palindrome (43312021334).

The spelling of 21211010122 in words is "twenty-one billion, two hundred eleven million, ten thousand, one hundred twenty-two".