1213525414021 has 4 divisors (see below), whose sum is σ = 1214749961344. Its totient is φ = 1212300866700.

The previous prime is 1213525414019. The next prime is 1213525414039. The reversal of 1213525414021 is 1204145253121.

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 not a de Polignac number, because 1213525414021 - 2¹ = 1213525414019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213525414001) 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, 612272175 + ... + 612274156.

It is an arithmetic number, because the mean of its divisors is an integer number (303687490336).

Almost surely, 2^{1213525414021} is an apocalyptic number.

It is an amenable number.

1213525414021 is a deficient number, since it is larger than the sum of its proper divisors (1224547323).

1213525414021 is an equidigital number, since it uses as much as digits as its factorization.

1213525414021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224547322.

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 1213525414021 in words is "one trillion, two hundred thirteen billion, five hundred twenty-five million, four hundred fourteen thousand, twenty-one".