1021200102020 has 48 divisors (see below), whose sum is σ = 2451279992448. Its totient is φ = 350068642560.

The previous prime is 1021200102017. The next prime is 1021200102031. The reversal of 1021200102020 is 202010021201.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1021200101992 and 1021200102010.

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, 271040 + ... + 1454600.

It is an arithmetic number, because the mean of its divisors is an integer number (51068333176).

Almost surely, 2^{1021200102020} is an apocalyptic number.

1021200102020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021200102020 is an abundant number, since it is smaller than the sum of its proper divisors (1430079890428).

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

1021200102020 is a wasteful number, since it uses less digits than its factorization.

1021200102020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189740 (or 1189738 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1021200102020 its reverse (202010021201), we get a palindrome (1223210123221).

The spelling of 1021200102020 in words is "one trillion, twenty-one billion, two hundred million, one hundred two thousand, twenty".