1021211110020 has 48 divisors (see below), whose sum is σ = 2859553831680. Its totient is φ = 272307465216.

The previous prime is 1021211110019. The next prime is 1021211110033. The reversal of 1021211110020 is 200111121201.

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 = 1021211109978 and 1021211110005.

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, 598836 + ... + 1549524.

It is an arithmetic number, because the mean of its divisors is an integer number (59574038160).

Almost surely, 2^{1021211110020} is an apocalyptic number.

1021211110020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021211110020 is an abundant number, since it is smaller than the sum of its proper divisors (1838342721660).

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

1021211110020 is a wasteful number, since it uses less digits than its factorization.

1021211110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968604 (or 968602 counting only the distinct ones).

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

Adding to 1021211110020 its reverse (200111121201), we get a palindrome (1221322231221).

The spelling of 1021211110020 in words is "one trillion, twenty-one billion, two hundred eleven million, one hundred ten thousand, twenty".