421231211154521 has 8 divisors (see below), whose sum is σ = 428089994317440. Its totient is φ = 414414897237712.

The previous prime is 421231211154503. The next prime is 421231211154571. The reversal of 421231211154521 is 125451112132124.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421231211154521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421231211154571) 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, 10617291530 + ... + 10617331203.

It is an arithmetic number, because the mean of its divisors is an integer number (53511249289680).

Almost surely, 2^{421231211154521} is an apocalyptic number.

It is an amenable number.

421231211154521 is a deficient number, since it is larger than the sum of its proper divisors (6858783162919).

421231211154521 is a wasteful number, since it uses less digits than its factorization.

421231211154521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21234623055.

The product of its digits is 19200, while the sum is 35.

Adding to 421231211154521 its reverse (125451112132124), we get a palindrome (546682323286645).

The spelling of 421231211154521 in words is "four hundred twenty-one trillion, two hundred thirty-one billion, two hundred eleven million, one hundred fifty-four thousand, five hundred twenty-one".