1211222002020 has 96 divisors (see below), whose sum is σ = 3595564764288. Its totient is φ = 303599511552.

The previous prime is 1211222002019. The next prime is 1211222002021. The reversal of 1211222002020 is 202002221121.

It is an interprime number because it is at equal distance from previous prime (1211222002019) and next prime (1211222002021).

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 (1211222002021) 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, 20367 + ... + 1556553.

It is an arithmetic number, because the mean of its divisors is an integer number (37453799628).

Almost surely, 2^{1211222002020} is an apocalyptic number.

1211222002020 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 1211222002020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1797782382144).

1211222002020 is an abundant number, since it is smaller than the sum of its proper divisors (2384342762268).

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

1211222002020 is a wasteful number, since it uses less digits than its factorization.

1211222002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536989 (or 1536987 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1211222002020 its reverse (202002221121), we get a palindrome (1413224223141).

The spelling of 1211222002020 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, two thousand, twenty".