1212021211020 has 96 divisors (see below), whose sum is σ = 3504079595520. Its totient is φ = 312695086080.

The previous prime is 1212021210877. The next prime is 1212021211021. The reversal of 1212021211020 is 201121202121.

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

It is not an unprimeable number, because it can be changed into a prime (1212021211021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6942724 + ... + 7115156.

It is an arithmetic number, because the mean of its divisors is an integer number (36500829120).

Almost surely, 2^{1212021211020} is an apocalyptic number.

1212021211020 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 1212021211020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1752039797760).

1212021211020 is an abundant number, since it is smaller than the sum of its proper divisors (2292058384500).

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

1212021211020 is a wasteful number, since it uses less digits than its factorization.

1212021211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176255 (or 176253 counting only the distinct ones).

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

Adding to 1212021211020 its reverse (201121202121), we get a palindrome (1413142413141).

The spelling of 1212021211020 in words is "one trillion, two hundred twelve billion, twenty-one million, two hundred eleven thousand, twenty".