40021421652 has 24 divisors (see below), whose sum is σ = 103759241600. Its totient is φ = 13340473848.

The previous prime is 40021421603. The next prime is 40021421663. The reversal of 40021421652 is 25612412004.

40021421652 is a `hidden beast` number, since 4 + 0 + 0 + 2 + 1 + 4 + 2 + 1 + 652 = 666.

40021421652 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185284252 + ... + 185284467.

Almost surely, 2^40021421652 is an apocalyptic number.

It is an amenable number.

40021421652 is an abundant number, since it is smaller than the sum of its proper divisors (63737819948).

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

40021421652 is a wasteful number, since it uses less digits than its factorization.

40021421652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370568732 (or 370568724 counting only the distinct ones).

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

Adding to 40021421652 its reverse (25612412004), we get a palindrome (65633833656).

The spelling of 40021421652 in words is "forty billion, twenty-one million, four hundred twenty-one thousand, six hundred fifty-two".