40102473721 has 4 divisors (see below), whose sum is σ = 40107111552. Its totient is φ = 40097835892.

The previous prime is 40102473707. The next prime is 40102473739. The reversal of 40102473721 is 12737420104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40102473721 - 2¹⁷ = 40102342649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40102473751) 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, 2305921 + ... + 2323246.

It is an arithmetic number, because the mean of its divisors is an integer number (10026777888).

Almost surely, 2^40102473721 is an apocalyptic number.

It is an amenable number.

40102473721 is a deficient number, since it is larger than the sum of its proper divisors (4637831).

40102473721 is an equidigital number, since it uses as much as digits as its factorization.

40102473721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4637830.

The product of its (nonzero) digits is 9408, while the sum is 31.

Adding to 40102473721 its reverse (12737420104), we get a palindrome (52839893825).

The spelling of 40102473721 in words is "forty billion, one hundred two million, four hundred seventy-three thousand, seven hundred twenty-one".