420021248551 has 8 divisors (see below), whose sum is σ = 420893582000. Its totient is φ = 419149038528.

The previous prime is 420021248513. The next prime is 420021248561. The reversal of 420021248551 is 155842120024.

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-420021248551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420021248561) 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, 10387465 + ... + 10427821.

It is an arithmetic number, because the mean of its divisors is an integer number (52611697750).

Almost surely, 2^420021248551 is an apocalyptic number.

420021248551 is a deficient number, since it is larger than the sum of its proper divisors (872333449).

420021248551 is a wasteful number, since it uses less digits than its factorization.

420021248551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61713.

The product of its (nonzero) digits is 25600, while the sum is 34.

Adding to 420021248551 its reverse (155842120024), we get a palindrome (575863368575).

The spelling of 420021248551 in words is "four hundred twenty billion, twenty-one million, two hundred forty-eight thousand, five hundred fifty-one".