351533252421 has 48 divisors (see below), whose sum is σ = 588809632320. Its totient is φ = 200152005120.

The previous prime is 351533252417. The next prime is 351533252437. The reversal of 351533252421 is 124252335153.

351533252421 is a `hidden beast` number, since 3 + 5 + 153 + 32 + 52 + 421 = 666.

It is not a de Polignac number, because 351533252421 - 2² = 351533252417 is a prime.

It is a super-2 number, since 2×351533252421² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (351533252401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1380435 + ... + 1615136.

It is an arithmetic number, because the mean of its divisors is an integer number (12266867340).

Almost surely, 2^351533252421 is an apocalyptic number.

It is an amenable number.

351533252421 is a deficient number, since it is larger than the sum of its proper divisors (237276379899).

351533252421 is a wasteful number, since it uses less digits than its factorization.

351533252421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2995666 (or 2995663 counting only the distinct ones).

The product of its digits is 108000, while the sum is 36.

Adding to 351533252421 its reverse (124252335153), we get a palindrome (475785587574).

The spelling of 351533252421 in words is "three hundred fifty-one billion, five hundred thirty-three million, two hundred fifty-two thousand, four hundred twenty-one".