1210002020021 has 16 divisors (see below), whose sum is σ = 1296317965824. Its totient is φ = 1125442788864.

The previous prime is 1210002020009. The next prime is 1210002020107. The reversal of 1210002020021 is 1200202000121.

It is a happy number.

It is not a de Polignac number, because 1210002020021 - 2³⁰ = 1208928278197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210002019984 and 1210002020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210008020021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 645515 + ... + 1684248.

It is an arithmetic number, because the mean of its divisors is an integer number (81019872864).

Almost surely, 2^{1210002020021} is an apocalyptic number.

It is an amenable number.

1210002020021 is a deficient number, since it is larger than the sum of its proper divisors (86315945803).

1210002020021 is a wasteful number, since it uses less digits than its factorization.

1210002020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330140.

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

Adding to 1210002020021 its reverse (1200202000121), we get a palindrome (2410204020142).

The spelling of 1210002020021 in words is "one trillion, two hundred ten billion, two million, twenty thousand, twenty-one".