21210225044 has 24 divisors (see below), whose sum is σ = 38156344128. Its totient is φ = 10312505280.

The previous prime is 21210225037. The next prime is 21210225053. The reversal of 21210225044 is 44052201212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 490802 + ... + 532265.

It is an arithmetic number, because the mean of its divisors is an integer number (1589847672).

Almost surely, 2^21210225044 is an apocalyptic number.

It is an amenable number.

21210225044 is a deficient number, since it is larger than the sum of its proper divisors (16946119084).

21210225044 is a wasteful number, since it uses less digits than its factorization.

21210225044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023215 (or 1023213 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 21210225044 its reverse (44052201212), we get a palindrome (65262426256).

The spelling of 21210225044 in words is "twenty-one billion, two hundred ten million, two hundred twenty-five thousand, forty-four".