1021200102021 has 32 divisors (see below), whose sum is σ = 1509128506368. Its totient is φ = 609072803840.

The previous prime is 1021200102017. The next prime is 1021200102031. The reversal of 1021200102021 is 1202010021201.

It is a cyclic number.

It is not a de Polignac number, because 1021200102021 - 2² = 1021200102017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021200101988 and 1021200102006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021200102031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21441 + ... + 1429286.

It is an arithmetic number, because the mean of its divisors is an integer number (47160265824).

Almost surely, 2^{1021200102021} is an apocalyptic number.

1021200102021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021200102021 is a deficient number, since it is larger than the sum of its proper divisors (487928404347).

1021200102021 is a wasteful number, since it uses less digits than its factorization.

1021200102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451081.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1021200102021 its reverse (1202010021201), we get a palindrome (2223210123222).

The spelling of 1021200102021 in words is "one trillion, twenty-one billion, two hundred million, one hundred two thousand, twenty-one".