153444213021421 has 4 divisors (see below), whose sum is σ = 175364814881632. Its totient is φ = 131523611161212.

The previous prime is 153444213021413. The next prime is 153444213021439. The reversal of 153444213021421 is 124120312444351.

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 153444213021421 - 2³ = 153444213021413 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 (153444213021721) 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, 10960300930095 + ... + 10960300930108.

It is an arithmetic number, because the mean of its divisors is an integer number (43841203720408).

Almost surely, 2^{153444213021421} is an apocalyptic number.

It is an amenable number.

153444213021421 is a deficient number, since it is larger than the sum of its proper divisors (21920601860211).

153444213021421 is an equidigital number, since it uses as much as digits as its factorization.

153444213021421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21920601860210.

The product of its (nonzero) digits is 92160, while the sum is 37.

Adding to 153444213021421 its reverse (124120312444351), we get a palindrome (277564525465772).

The spelling of 153444213021421 in words is "one hundred fifty-three trillion, four hundred forty-four billion, two hundred thirteen million, twenty-one thousand, four hundred twenty-one".