421101520 has 160 divisors (see below), whose sum is σ = 1170210816. Its totient is φ = 137894400.

The previous prime is 421101517. The next prime is 421101523. The reversal of 421101520 is 25101124.

It is an interprime number because it is at equal distance from previous prime (421101517) and next prime (421101523).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 421101494 and 421101503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421101523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2204625 + ... + 2204815.

Almost surely, 2^421101520 is an apocalyptic number.

421101520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421101520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (585105408).

421101520 is an abundant number, since it is smaller than the sum of its proper divisors (749109296).

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

421101520 is a wasteful number, since it uses less digits than its factorization.

421101520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 421101520 is about 20520.7582705903. The cubic root of 421101520 is about 749.5413610724.

Adding to 421101520 its reverse (25101124), we get a palindrome (446202644).

The spelling of 421101520 in words is "four hundred twenty-one million, one hundred one thousand, five hundred twenty".