43121241451021 has 4 divisors (see below), whose sum is σ = 44996078035872. Its totient is φ = 41246404866172.

The previous prime is 43121241451009. The next prime is 43121241451121. The reversal of 43121241451021 is 12015414212134.

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 43121241451021 - 2²⁵ = 43121207896589 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 (43121241451121) 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, 937418292391 + ... + 937418292436.

It is an arithmetic number, because the mean of its divisors is an integer number (11249019508968).

Almost surely, 2^{43121241451021} is an apocalyptic number.

It is an amenable number.

43121241451021 is a deficient number, since it is larger than the sum of its proper divisors (1874836584851).

43121241451021 is a wasteful number, since it uses less digits than its factorization.

43121241451021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874836584850.

The product of its (nonzero) digits is 7680, while the sum is 31.

Adding to 43121241451021 its reverse (12015414212134), we get a palindrome (55136655663155).

It can be divided in two parts, 43121 and 241451021, that added together give a palindrome (241494142).

The spelling of 43121241451021 in words is "forty-three trillion, one hundred twenty-one billion, two hundred forty-one million, four hundred fifty-one thousand, twenty-one".