40221145720 has 32 divisors (see below), whose sum is σ = 103425804000. Its totient is φ = 13790107008.

The previous prime is 40221145717. The next prime is 40221145729. The reversal of 40221145720 is 2754112204.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40221145729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71823195 + ... + 71823754.

It is an arithmetic number, because the mean of its divisors is an integer number (3232056375).

Almost surely, 2^40221145720 is an apocalyptic number.

40221145720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40221145720 is an abundant number, since it is smaller than the sum of its proper divisors (63204658280).

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

40221145720 is a wasteful number, since it uses less digits than its factorization.

40221145720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143646967 (or 143646963 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

Adding to 40221145720 its reverse (2754112204), we get a palindrome (42975257924).

It can be divided in two parts, 402211 and 45720, that added together give a triangular number (447931 = T₉₄₆).

The spelling of 40221145720 in words is "forty billion, two hundred twenty-one million, one hundred forty-five thousand, seven hundred twenty".