21836202706122 has 128 divisors (see below), whose sum is σ = 53996100802560. Its totient is φ = 5746765397760.

The previous prime is 21836202706121. The next prime is 21836202706139. The reversal of 21836202706122 is 22160720263812.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (21836202706121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 41874472 + ... + 42392732.

It is an arithmetic number, because the mean of its divisors is an integer number (421844537520).

Almost surely, 2^{21836202706122} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21836202706122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26998050401280).

21836202706122 is an abundant number, since it is smaller than the sum of its proper divisors (32159898096438).

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

21836202706122 is a wasteful number, since it uses less digits than its factorization.

21836202706122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519756.

The product of its (nonzero) digits is 193536, while the sum is 42.

Adding to 21836202706122 its reverse (22160720263812), we get a palindrome (43996922969934).

The spelling of 21836202706122 in words is "twenty-one trillion, eight hundred thirty-six billion, two hundred two million, seven hundred six thousand, one hundred twenty-two".