21101210202122 has 16 divisors (see below), whose sum is σ = 34092530561760. Its totient is φ = 9762861022992.

The previous prime is 21101210202119. The next prime is 21101210202157. The reversal of 21101210202122 is 22120201210112.

It is a super-2 number, since 2×21101210202122² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21101210202122.

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, 6456917033 + ... + 6456920300.

It is an arithmetic number, because the mean of its divisors is an integer number (2130783160110).

Almost surely, 2^{21101210202122} is an apocalyptic number.

21101210202122 is a deficient number, since it is larger than the sum of its proper divisors (12991320359638).

21101210202122 is a wasteful number, since it uses less digits than its factorization.

21101210202122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12913837397.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21101210202122 its reverse (22120201210112), we get a palindrome (43221411412234).

The spelling of 21101210202122 in words is "twenty-one trillion, one hundred one billion, two hundred ten million, two hundred two thousand, one hundred twenty-two".