4021521642 has 32 divisors (see below), whose sum is σ = 9028857600. Its totient is φ = 1326685824.

The previous prime is 4021521607. The next prime is 4021521653. The reversal of 4021521642 is 2461251204.

4021521642 is a `hidden beast` number, since 4 + 0 + 2 + 15 + 2 + 1 + 642 = 666.

It is a super-3 number, since 3×4021521642³ (a number of 30 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 378642 + ... + 389117.

It is an arithmetic number, because the mean of its divisors is an integer number (282151800).

Almost surely, 2^4021521642 is an apocalyptic number.

4021521642 is an abundant number, since it is smaller than the sum of its proper divisors (5007335958).

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

4021521642 is a wasteful number, since it uses less digits than its factorization.

4021521642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767867 (or 767861 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 4021521642 is about 63415.4684757591. The cubic root of 4021521642 is about 1590.2429176737.

Adding to 4021521642 its reverse (2461251204), we get a palindrome (6482772846).

The spelling of 4021521642 in words is "four billion, twenty-one million, five hundred twenty-one thousand, six hundred forty-two".