21004131412121 has 8 divisors (see below), whose sum is σ = 24676182358464. Its totient is φ = 17625844541520.

The previous prime is 21004131412087. The next prime is 21004131412177. The reversal of 21004131412121 is 12121413140012.

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 21004131412121 - 2²² = 21004127217817 is a prime.

It is a super-2 number, since 2×21004131412121² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21004131412421) 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, 73441018781 + ... + 73441019066.

It is an arithmetic number, because the mean of its divisors is an integer number (3084522794808).

Almost surely, 2^{21004131412121} is an apocalyptic number.

It is an amenable number.

21004131412121 is a deficient number, since it is larger than the sum of its proper divisors (3672050946343).

21004131412121 is a wasteful number, since it uses less digits than its factorization.

21004131412121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146882037871.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 21004131412121 its reverse (12121413140012), we get a palindrome (33125544552133).

The spelling of 21004131412121 in words is "twenty-one trillion, four billion, one hundred thirty-one million, four hundred twelve thousand, one hundred twenty-one".