45215929721 has 2 divisors, whose sum is σ = 45215929722. Its totient is φ = 45215929720.

The previous prime is 45215929699. The next prime is 45215929729. The reversal of 45215929721 is 12792951254.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38874037225 + 6341892496 = 197165^2 + 79636^2 .

It is a cyclic number.

It is not a de Polignac number, because 45215929721 - 2⁶ = 45215929657 is a prime.

It is a super-2 number, since 2×45215929721² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (45215929729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22607964860 + 22607964861.

It is an arithmetic number, because the mean of its divisors is an integer number (22607964861).

Almost surely, 2^45215929721 is an apocalyptic number.

It is an amenable number.

45215929721 is a deficient number, since it is larger than the sum of its proper divisors (1).

45215929721 is an equidigital number, since it uses as much as digits as its factorization.

45215929721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 47.

The spelling of 45215929721 in words is "forty-five billion, two hundred fifteen million, nine hundred twenty-nine thousand, seven hundred twenty-one".