1213002020021 has 4 divisors (see below), whose sum is σ = 1323274930944. Its totient is φ = 1102729109100.

The previous prime is 1213002019981. The next prime is 1213002020047. The reversal of 1213002020021 is 1200202003121.

It is a happy number.

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-1213002020021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213002019978 and 1213002020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213002020071) 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, 55136455445 + ... + 55136455466.

It is an arithmetic number, because the mean of its divisors is an integer number (330818732736).

Almost surely, 2^{1213002020021} is an apocalyptic number.

1213002020021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1213002020021 is a deficient number, since it is larger than the sum of its proper divisors (110272910923).

1213002020021 is a wasteful number, since it uses less digits than its factorization.

1213002020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110272910922.

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

Adding to 1213002020021 its reverse (1200202003121), we get a palindrome (2413204023142).

The spelling of 1213002020021 in words is "one trillion, two hundred thirteen billion, two million, twenty thousand, twenty-one".