40201351621 has 4 divisors (see below), whose sum is σ = 40471159500. Its totient is φ = 39931543744.

The previous prime is 40201351601. The next prime is 40201351627. The reversal of 40201351621 is 12615310204.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12608819521 + 27592532100 = 112289^2 + 166110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40201351621 is a prime.

It is a super-2 number, since 2×40201351621² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40201351627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134903716 + ... + 134904013.

It is an arithmetic number, because the mean of its divisors is an integer number (10117789875).

Almost surely, 2^40201351621 is an apocalyptic number.

It is an amenable number.

40201351621 is a deficient number, since it is larger than the sum of its proper divisors (269807879).

40201351621 is a wasteful number, since it uses less digits than its factorization.

40201351621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269807878.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 40201351621 its reverse (12615310204), we get a palindrome (52816661825).

The spelling of 40201351621 in words is "forty billion, two hundred one million, three hundred fifty-one thousand, six hundred twenty-one".