421011021525 has 24 divisors (see below), whose sum is σ = 707482572384. Its totient is φ = 220858238400.

The previous prime is 421011021493. The next prime is 421011021569. The reversal of 421011021525 is 525120110124.

It is a happy number.

It is not a de Polignac number, because 421011021525 - 2⁵ = 421011021493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421011021495 and 421011021504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46007559 + ... + 46016708.

It is an arithmetic number, because the mean of its divisors is an integer number (29478440516).

Almost surely, 2^421011021525 is an apocalyptic number.

It is an amenable number.

421011021525 is a deficient number, since it is larger than the sum of its proper divisors (286471550859).

421011021525 is a wasteful number, since it uses less digits than its factorization.

421011021525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92024341 (or 92024336 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 421011021525 its reverse (525120110124), we get a palindrome (946131131649).

The spelling of 421011021525 in words is "four hundred twenty-one billion, eleven million, twenty-one thousand, five hundred twenty-five".