21054411542 has 4 divisors (see below), whose sum is σ = 31581617316. Its totient is φ = 10527205770.

The previous prime is 21054411529. The next prime is 21054411559. The reversal of 21054411542 is 24511445012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5263602884 + ... + 5263602887.

It is an arithmetic number, because the mean of its divisors is an integer number (7895404329).

Almost surely, 2^21054411542 is an apocalyptic number.

21054411542 is a deficient number, since it is larger than the sum of its proper divisors (10527205774).

21054411542 is a wasteful number, since it uses less digits than its factorization.

21054411542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10527205773.

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 21054411542 its reverse (24511445012), we get a palindrome (45565856554).

The spelling of 21054411542 in words is "twenty-one billion, fifty-four million, four hundred eleven thousand, five hundred forty-two".