1001211101020 has 48 divisors (see below), whose sum is σ = 2266176084480. Its totient is φ = 369367958016.

The previous prime is 1001211101003. The next prime is 1001211101053. The reversal of 1001211101020 is 201011121001.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1001211100988 and 1001211101006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1303740 + ... + 1924099.

It is an arithmetic number, because the mean of its divisors is an integer number (47212001760).

Almost surely, 2^{1001211101020} is an apocalyptic number.

1001211101020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001211101020 is an abundant number, since it is smaller than the sum of its proper divisors (1264964983460).

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

1001211101020 is a wasteful number, since it uses less digits than its factorization.

1001211101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3229054 (or 3229052 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1001211101020 its reverse (201011121001), we get a palindrome (1202222222021).

The spelling of 1001211101020 in words is "one trillion, one billion, two hundred eleven million, one hundred one thousand, twenty".