21042222040 has 32 divisors (see below), whose sum is σ = 54108571680. Its totient is φ = 7214476032.

The previous prime is 21042222031. The next prime is 21042222109. The reversal of 21042222040 is 4022224012.

It is a junction number, because it is equal to n+sod(n) for n = 21042221999 and 21042222017.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37575117 + ... + 37575676.

It is an arithmetic number, because the mean of its divisors is an integer number (1690892865).

Almost surely, 2^21042222040 is an apocalyptic number.

21042222040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21042222040 is an abundant number, since it is smaller than the sum of its proper divisors (33066349640).

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

21042222040 is a wasteful number, since it uses less digits than its factorization.

21042222040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75150811 (or 75150807 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 21042222040 its reverse (4022224012), we get a palindrome (25064446052).

The spelling of 21042222040 in words is "twenty-one billion, forty-two million, two hundred twenty-two thousand, forty".