21009629043 has 96 divisors (see below), whose sum is σ = 35103111680. Its totient is φ = 12344088960.

The previous prime is 21009628973. The next prime is 21009629077. The reversal of 21009629043 is 34092690012.

21009629043 is a `hidden beast` number, since 21 + 0 + 0 + 9 + 629 + 0 + 4 + 3 = 666.

It is not a de Polignac number, because 21009629043 - 2¹³ = 21009620851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21009628989 and 21009629007.

It is not an unprimeable number, because it can be changed into a prime (21009629093) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 30404328 + ... + 30405018.

Almost surely, 2^21009629043 is an apocalyptic number.

21009629043 is a deficient number, since it is larger than the sum of its proper divisors (14093482637).

21009629043 is a wasteful number, since it uses less digits than its factorization.

21009629043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874 (or 839 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The spelling of 21009629043 in words is "twenty-one billion, nine million, six hundred twenty-nine thousand, forty-three".