41221619721 has 12 divisors (see below), whose sum is σ = 59664609472. Its totient is φ = 27424647576.

The previous prime is 41221619713. The next prime is 41221619723. The reversal of 41221619721 is 12791612214.

41221619721 is a `hidden beast` number, since 4 + 12 + 2 + 1 + 619 + 7 + 21 = 666.

It is not a de Polignac number, because 41221619721 - 2³ = 41221619713 is a prime.

It is a super-2 number, since 2×41221619721² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (41221619723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4698061 + ... + 4706826.

Almost surely, 2^41221619721 is an apocalyptic number.

It is an amenable number.

41221619721 is a deficient number, since it is larger than the sum of its proper divisors (18442989751).

41221619721 is a wasteful number, since it uses less digits than its factorization.

41221619721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9405380 (or 9405377 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The spelling of 41221619721 in words is "forty-one billion, two hundred twenty-one million, six hundred nineteen thousand, seven hundred twenty-one".