1021210202021 has 4 divisors (see below), whose sum is σ = 1023536421600. Its totient is φ = 1018883982444.

The previous prime is 1021210202009. The next prime is 1021210202027. The reversal of 1021210202021 is 1202020121201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021210202021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021210201987 and 1021210202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021210202027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1163109131 + ... + 1163110008.

It is an arithmetic number, because the mean of its divisors is an integer number (255884105400).

Almost surely, 2^{1021210202021} is an apocalyptic number.

It is an amenable number.

1021210202021 is a deficient number, since it is larger than the sum of its proper divisors (2326219579).

1021210202021 is an equidigital number, since it uses as much as digits as its factorization.

1021210202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2326219578.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1021210202021 its reverse (1202020121201), we get a palindrome (2223230323222).

The spelling of 1021210202021 in words is "one trillion, twenty-one billion, two hundred ten million, two hundred two thousand, twenty-one".