21403422044 has 24 divisors (see below), whose sum is σ = 39692646000. Its totient is φ = 10080667520.

The previous prime is 21403421993. The next prime is 21403422049. The reversal of 21403422044 is 44022430412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403422049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2245394 + ... + 2254905.

It is an arithmetic number, because the mean of its divisors is an integer number (1653860250).

Almost surely, 2^21403422044 is an apocalyptic number.

It is an amenable number.

21403422044 is a deficient number, since it is larger than the sum of its proper divisors (18289223956).

21403422044 is a wasteful number, since it uses less digits than its factorization.

21403422044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4500373 (or 4500371 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 21403422044 its reverse (44022430412), we get a palindrome (65425852456).

The spelling of 21403422044 in words is "twenty-one billion, four hundred three million, four hundred twenty-two thousand, forty-four".