21012221210122 has 16 divisors (see below), whose sum is σ = 31953080662272. Its totient is φ = 10361221267680.

The previous prime is 21012221210077. The next prime is 21012221210153. The reversal of 21012221210122 is 22101212221012.

It is a self number, because there is not a number n which added to its sum of digits gives 21012221210122.

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, 5169978 + ... + 8291749.

It is an arithmetic number, because the mean of its divisors is an integer number (1997067541392).

Almost surely, 2^{21012221210122} is an apocalyptic number.

21012221210122 is a deficient number, since it is larger than the sum of its proper divisors (10940859452150).

21012221210122 is a wasteful number, since it uses less digits than its factorization.

21012221210122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13472493.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21012221210122 its reverse (22101212221012), we get a palindrome (43113433431134).

The spelling of 21012221210122 in words is "twenty-one trillion, twelve billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-two".