420215511044550 has 288 divisors, whose sum is σ = 1187212239366048. Its totient is φ = 97767192637440.

The previous prime is 420215511044507. The next prime is 420215511044573. The reversal of 420215511044550 is 55440115512024.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 420215511044499 and 420215511044508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 304121044 + ... + 305499656.

It is an arithmetic number, because the mean of its divisors is an integer number (4122264720021).

Almost surely, 2^{420215511044550} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 420215511044550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (593606119683024).

420215511044550 is an abundant number, since it is smaller than the sum of its proper divisors (766996728321498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420215511044550 is a wasteful number, since it uses less digits than its factorization.

420215511044550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379112 (or 1379088 counting only the distinct ones).

The product of its (nonzero) digits is 160000, while the sum is 39.

Adding to 420215511044550 its reverse (55440115512024), we get a palindrome (475655626556574).

The spelling of 420215511044550 in words is "four hundred twenty trillion, two hundred fifteen billion, five hundred eleven million, forty-four thousand, five hundred fifty".