21044053542 has 32 divisors (see below), whose sum is σ = 43879511808. Its totient is φ = 6722273376.

The previous prime is 21044053501. The next prime is 21044053553. The reversal of 21044053542 is 24535044012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 755818 + ... + 783165.

It is an arithmetic number, because the mean of its divisors is an integer number (1371234744).

Almost surely, 2^21044053542 is an apocalyptic number.

21044053542 is an abundant number, since it is smaller than the sum of its proper divisors (22835458266).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21044053542 is a wasteful number, since it uses less digits than its factorization.

21044053542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539084.

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21044053542 its reverse (24535044012), we get a palindrome (45579097554).

The spelling of 21044053542 in words is "twenty-one billion, forty-four million, fifty-three thousand, five hundred forty-two".