20211111122010 has 128 divisors (see below), whose sum is σ = 51975046932480. Its totient is φ = 5012019707904.

The previous prime is 20211111122003. The next prime is 20211111122011. The reversal of 20211111122010 is 1022111111202.

It is a happy number.

It is a super-2 number, since 2×20211111122010² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20211111122011) 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, 29691756 + ... + 30364824.

It is an arithmetic number, because the mean of its divisors is an integer number (406055054160).

Almost surely, 2^{20211111122010} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20211111122010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25987523466240).

20211111122010 is an abundant number, since it is smaller than the sum of its proper divisors (31763935810470).

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

20211111122010 is a wasteful number, since it uses less digits than its factorization.

20211111122010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673800.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20211111122010 its reverse (1022111111202), we get a palindrome (21233222233212).

The spelling of 20211111122010 in words is "twenty trillion, two hundred eleven billion, one hundred eleven million, one hundred twenty-two thousand, ten".