21409835041 has 9 divisors (see below), whose sum is σ = 24906509841. Its totient is φ = 18350409252.

The previous prime is 21409835033. The next prime is 21409835047. The reversal of 21409835041 is 14053890412.

The square root of 21409835041 is 146321.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 21409835041 - 2³ = 21409835033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21409835047) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1013796 + ... + 1034698.

Almost surely, 2^21409835041 is an apocalyptic number.

21409835041 is the 146321-st square number.

21409835041 is the 73161-st centered octagonal number.

It is an amenable number.

21409835041 is a deficient number, since it is larger than the sum of its proper divisors (3496674800).

21409835041 is an frugal number, since it uses more digits than its factorization.

21409835041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41820 (or 20910 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 21409835041 in words is "twenty-one billion, four hundred nine million, eight hundred thirty-five thousand, forty-one".