10421020440 has 256 divisors, whose sum is σ = 36796032000. Its totient is φ = 2616053760.

The previous prime is 10421020427. The next prime is 10421020447. The reversal of 10421020440 is 4402012401.

10421020440 is a `hidden beast` number, since 1 + 0 + 421 + 0 + 204 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10421020447) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3425320 + ... + 3428360.

It is an arithmetic number, because the mean of its divisors is an integer number (143734500).

Almost surely, 2^10421020440 is an apocalyptic number.

10421020440 is a gapful number since it is divisible by the number (10) 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 10421020440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18398016000).

10421020440 is an abundant number, since it is smaller than the sum of its proper divisors (26375011560).

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

10421020440 is a wasteful number, since it uses less digits than its factorization.

10421020440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3247 (or 3237 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 10421020440 its reverse (4402012401), we get a palindrome (14823032841).

The spelling of 10421020440 in words is "ten billion, four hundred twenty-one million, twenty thousand, four hundred forty".