21121421150243 has 8 divisors (see below), whose sum is σ = 21433915802880. Its totient is φ = 20809343437960.

The previous prime is 21121421150239. The next prime is 21121421150287. The reversal of 21121421150243 is 34205112412112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21121421150243 - 2² = 21121421150239 is a prime.

It is a super-2 number, since 2×21121421150243² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121421150213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104133023 + ... + 104335656.

It is an arithmetic number, because the mean of its divisors is an integer number (2679239475360).

Almost surely, 2^{21121421150243} is an apocalyptic number.

21121421150243 is a deficient number, since it is larger than the sum of its proper divisors (312494652637).

21121421150243 is a wasteful number, since it uses less digits than its factorization.

21121421150243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208470177.

The product of its (nonzero) digits is 3840, while the sum is 29.

Adding to 21121421150243 its reverse (34205112412112), we get a palindrome (55326533562355).

The spelling of 21121421150243 in words is "twenty-one trillion, one hundred twenty-one billion, four hundred twenty-one million, one hundred fifty thousand, two hundred forty-three".