420021002604 has 96 divisors (see below), whose sum is σ = 1144003392000. Its totient is φ = 119891647680.

The previous prime is 420021002567. The next prime is 420021002641. The reversal of 420021002604 is 406200120024.

It is an interprime number because it is at equal distance from previous prime (420021002567) and next prime (420021002641).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4318987 + ... + 4415165.

It is an arithmetic number, because the mean of its divisors is an integer number (11916702000).

Almost surely, 2^420021002604 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 420021002604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (572001696000).

420021002604 is an abundant number, since it is smaller than the sum of its proper divisors (723982389396).

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

420021002604 is a wasteful number, since it uses less digits than its factorization.

420021002604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97268 (or 97252 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 420021002604 its reverse (406200120024), we get a palindrome (826221122628).

The spelling of 420021002604 in words is "four hundred twenty billion, twenty-one million, two thousand, six hundred four".