21429047355 has 32 divisors (see below), whose sum is σ = 34439888448. Its totient is φ = 11377766400.

The previous prime is 21429047327. The next prime is 21429047359. The reversal of 21429047355 is 55374092412.

It is a happy number.

It is not a de Polignac number, because 21429047355 - 2¹⁴ = 21429030971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21429047359) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7488625 + ... + 7491485.

It is an arithmetic number, because the mean of its divisors is an integer number (1076246514).

Almost surely, 2^21429047355 is an apocalyptic number.

21429047355 is a deficient number, since it is larger than the sum of its proper divisors (13010841093).

21429047355 is a wasteful number, since it uses less digits than its factorization.

21429047355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4927.

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 21429047355 in words is "twenty-one billion, four hundred twenty-nine million, forty-seven thousand, three hundred fifty-five".