40222721 has 8 divisors (see below), whose sum is σ = 50147904. Its totient is φ = 31342320.

The previous prime is 40222709. The next prime is 40222757. The reversal of 40222721 is 12722204.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40222721 - 2¹⁸ = 39960577 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40222693 and 40222702.

It is not an unprimeable number, because it can be changed into a prime (40222121) 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, 261110 + ... + 261263.

It is an arithmetic number, because the mean of its divisors is an integer number (6268488).

It is a Proth number, since it is equal to 2455 ⋅ 2¹⁴ + 1 and 2455 < 2¹⁴.

Almost surely, 2^40222721 is an apocalyptic number.

It is an amenable number.

40222721 is a deficient number, since it is larger than the sum of its proper divisors (9925183).

40222721 is a wasteful number, since it uses less digits than its factorization.

40222721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522391.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 40222721 is about 6342.1385194586. The cubic root of 40222721 is about 342.6287607938.

Adding to 40222721 its reverse (12722204), we get a palindrome (52944925).

The spelling of 40222721 in words is "forty million, two hundred twenty-two thousand, seven hundred twenty-one".