1213000202021 has 4 divisors (see below), whose sum is σ = 1242585572844. Its totient is φ = 1183414831200.

The previous prime is 1213000201981. The next prime is 1213000202041. The reversal of 1213000202021 is 1202020003121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 676753022500 + 536247179521 = 822650^2 + 732289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213000202021 is a prime.

It is a super-3 number, since 3×1213000202021³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213000201987 and 1213000202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213000202041) 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, 14792685350 + ... + 14792685431.

It is an arithmetic number, because the mean of its divisors is an integer number (310646393211).

Almost surely, 2^{1213000202021} is an apocalyptic number.

It is an amenable number.

1213000202021 is a deficient number, since it is larger than the sum of its proper divisors (29585370823).

1213000202021 is an equidigital number, since it uses as much as digits as its factorization.

1213000202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29585370822.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 1213000202021 its reverse (1202020003121), we get a palindrome (2415020205142).

The spelling of 1213000202021 in words is "one trillion, two hundred thirteen billion, two hundred two thousand, twenty-one".