40429544921 has 2 divisors, whose sum is σ = 40429544922. Its totient is φ = 40429544920.

The previous prime is 40429544893. The next prime is 40429544951. The reversal of 40429544921 is 12944592404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32041000000 + 8388544921 = 179000^2 + 91589^2 .

It is a cyclic number.

It is not a de Polignac number, because 40429544921 - 2²⁶ = 40362436057 is a prime.

It is not a weakly prime, because it can be changed into another prime (40429544951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20214772460 + 20214772461.

It is an arithmetic number, because the mean of its divisors is an integer number (20214772461).

Almost surely, 2^40429544921 is an apocalyptic number.

It is an amenable number.

40429544921 is a deficient number, since it is larger than the sum of its proper divisors (1).

40429544921 is an equidigital number, since it uses as much as digits as its factorization.

40429544921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 40429544921 in words is "forty billion, four hundred twenty-nine million, five hundred forty-four thousand, nine hundred twenty-one".