1213130123021 has 16 divisors (see below), whose sum is σ = 1220401987200. Its totient is φ = 1205882255808.

The previous prime is 1213130122951. The next prime is 1213130123039. The reversal of 1213130123021 is 1203210313121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1213130123021 - 2¹⁰ = 1213130121997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213130122984 and 1213130123002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213130123071) 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, 264699896 + ... + 264704478.

It is an arithmetic number, because the mean of its divisors is an integer number (76275124200).

Almost surely, 2^{1213130123021} is an apocalyptic number.

It is an amenable number.

1213130123021 is a deficient number, since it is larger than the sum of its proper divisors (7271864179).

1213130123021 is a wasteful number, since it uses less digits than its factorization.

1213130123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6868.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1213130123021 its reverse (1203210313121), we get a palindrome (2416340436142).

The spelling of 1213130123021 in words is "one trillion, two hundred thirteen billion, one hundred thirty million, one hundred twenty-three thousand, twenty-one".