21235742554 has 32 divisors (see below), whose sum is σ = 35119687680. Its totient is φ = 9568262592.

The previous prime is 21235742551. The next prime is 21235742569. The reversal of 21235742554 is 45524753212.

It is not an unprimeable number, because it can be changed into a prime (21235742551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3000532 + ... + 3007600.

It is an arithmetic number, because the mean of its divisors is an integer number (1097490240).

Almost surely, 2^21235742554 is an apocalyptic number.

21235742554 is a deficient number, since it is larger than the sum of its proper divisors (13883945126).

21235742554 is a wasteful number, since it uses less digits than its factorization.

21235742554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9814.

The product of its digits is 336000, while the sum is 40.

The spelling of 21235742554 in words is "twenty-one billion, two hundred thirty-five million, seven hundred forty-two thousand, five hundred fifty-four".