1021211101020 has 96 divisors (see below), whose sum is σ = 3124743019776. Its totient is φ = 247137177600.

The previous prime is 1021211101003. The next prime is 1021211101021. The reversal of 1021211101020 is 201011121201.

It is a super-2 number, since 2×1021211101020² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1021211100987 and 1021211101005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021211101021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 959986 + ... + 1721625.

It is an arithmetic number, because the mean of its divisors is an integer number (32549406456).

Almost surely, 2^{1021211101020} is an apocalyptic number.

1021211101020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021211101020 is an abundant number, since it is smaller than the sum of its proper divisors (2103531918756).

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

1021211101020 is a wasteful number, since it uses less digits than its factorization.

1021211101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2682211 (or 2682209 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1021211101020 its reverse (201011121201), we get a palindrome (1222222222221).

The spelling of 1021211101020 in words is "one trillion, twenty-one billion, two hundred eleven million, one hundred one thousand, twenty".