1210020011021 has 4 divisors (see below), whose sum is σ = 1210042290912. Its totient is φ = 1209997731132.

The previous prime is 1210020011009. The next prime is 1210020011033. The reversal of 1210020011021 is 1201100200121.

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 an interprime number because it is at equal distance from previous prime (1210020011009) and next prime (1210020011033).

It is a cyclic number.

It is not a de Polignac number, because 1210020011021 - 2⁶ = 1210020010957 is a prime.

It is a super-2 number, since 2×1210020011021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210020010993 and 1210020011011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210020013021) 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, 11058281 + ... + 11167166.

It is an arithmetic number, because the mean of its divisors is an integer number (302510572728).

Almost surely, 2^{1210020011021} is an apocalyptic number.

It is an amenable number.

1210020011021 is a deficient number, since it is larger than the sum of its proper divisors (22279891).

1210020011021 is an equidigital number, since it uses as much as digits as its factorization.

1210020011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22279890.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1210020011021 its reverse (1201100200121), we get a palindrome (2411120211142).

The spelling of 1210020011021 in words is "one trillion, two hundred ten billion, twenty million, eleven thousand, twenty-one".