21355534604434 has 32 divisors (see below), whose sum is σ = 33425444505024. Its totient is φ = 10223864064960.

The previous prime is 21355534604431. The next prime is 21355534604479. The reversal of 21355534604434 is 43440643555312.

It is not an unprimeable number, because it can be changed into a prime (21355534604431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3286644 + ... + 7315264.

It is an arithmetic number, because the mean of its divisors is an integer number (1044545140782).

Almost surely, 2^{21355534604434} is an apocalyptic number.

21355534604434 is a deficient number, since it is larger than the sum of its proper divisors (12069909900590).

21355534604434 is a wasteful number, since it uses less digits than its factorization.

21355534604434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4029882.

The product of its (nonzero) digits is 10368000, while the sum is 49.

The spelling of 21355534604434 in words is "twenty-one trillion, three hundred fifty-five billion, five hundred thirty-four million, six hundred four thousand, four hundred thirty-four".