21430751841 has 12 divisors (see below), whose sum is σ = 30959113380. Its totient is φ = 14285514240.

The previous prime is 21430751827. The next prime is 21430751843. The reversal of 21430751841 is 14815703412.

It can be written as a sum of positive squares in 2 ways, for example, as 6198255441 + 15232496400 = 78729^2 + 123420^2 .

It is not a de Polignac number, because 21430751841 - 2⁵ = 21430751809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21430751796 and 21430751805.

It is not an unprimeable number, because it can be changed into a prime (21430751843) 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, 52980 + ... + 213701.

It is an arithmetic number, because the mean of its divisors is an integer number (2579926115).

Almost surely, 2^21430751841 is an apocalyptic number.

It is an amenable number.

21430751841 is a deficient number, since it is larger than the sum of its proper divisors (9528361539).

21430751841 is a wasteful number, since it uses less digits than its factorization.

21430751841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275616 (or 275613 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 21430751841 in words is "twenty-one billion, four hundred thirty million, seven hundred fifty-one thousand, eight hundred forty-one".