402241021020 has 72 divisors (see below), whose sum is σ = 1224770522976. Its totient is φ = 106856410752.

The previous prime is 402241020991. The next prime is 402241021109. The reversal of 402241021020 is 20120142204.

402241021020 is a `hidden beast` number, since 4 + 0 + 22 + 410 + 210 + 20 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 402241020984 and 402241021002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4201087 + ... + 4295766.

It is an arithmetic number, because the mean of its divisors is an integer number (17010701708).

Almost surely, 2^402241021020 is an apocalyptic number.

It is an amenable number.

402241021020 is an abundant number, since it is smaller than the sum of its proper divisors (822529501956).

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

402241021020 is a wasteful number, since it uses less digits than its factorization.

402241021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8497131 (or 8497126 counting only the distinct ones).

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

Adding to 402241021020 its reverse (20120142204), we get a palindrome (422361163224).

The spelling of 402241021020 in words is "four hundred two billion, two hundred forty-one million, twenty-one thousand, twenty".