1211121022020 has 1152 divisors, whose sum is σ = 4683555717120. Its totient is φ = 228521779200.

The previous prime is 1211121021967. The next prime is 1211121022061. The reversal of 1211121022020 is 202201211121.

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

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 8020668945 + ... + 8020669095.

It is an arithmetic number, because the mean of its divisors is an integer number (4065586560).

Almost surely, 2^{1211121022020} is an apocalyptic number.

1211121022020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211121022020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2341777858560).

1211121022020 is an abundant number, since it is smaller than the sum of its proper divisors (3472434695100).

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

1211121022020 is a wasteful number, since it uses less digits than its factorization.

1211121022020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1211121022020 its reverse (202201211121), we get a palindrome (1413322233141).

The spelling of 1211121022020 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, twenty-two thousand, twenty".