1553030231021 has 4 divisors (see below), whose sum is σ = 1553032848000. Its totient is φ = 1553027614044.

The previous prime is 1553030231003. The next prime is 1553030231057. The reversal of 1553030231021 is 1201320303551.

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 1553030231021 - 2¹⁸ = 1553029968877 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 (1553030231521) 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, 55910 + ... + 1763288.

It is an arithmetic number, because the mean of its divisors is an integer number (388258212000).

Almost surely, 2^{1553030231021} is an apocalyptic number.

It is an amenable number.

1553030231021 is a deficient number, since it is larger than the sum of its proper divisors (2616979).

1553030231021 is an equidigital number, since it uses as much as digits as its factorization.

1553030231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2616978.

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 1553030231021 its reverse (1201320303551), we get a palindrome (2754350534572).

The spelling of 1553030231021 in words is "one trillion, five hundred fifty-three billion, thirty million, two hundred thirty-one thousand, twenty-one".