21000040350 has 24 divisors (see below), whose sum is σ = 52080100440. Its totient is φ = 5600010720.

The previous prime is 21000040331. The next prime is 21000040363. The reversal of 21000040350 is 5304000012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69999985 + ... + 70000284.

It is an arithmetic number, because the mean of its divisors is an integer number (2170004185).

Almost surely, 2^21000040350 is an apocalyptic number.

21000040350 is an abundant number, since it is smaller than the sum of its proper divisors (31080060090).

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

21000040350 is a wasteful number, since it uses less digits than its factorization.

21000040350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140000284 (or 140000279 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

Adding to 21000040350 its reverse (5304000012), we get a palindrome (26304040362).

The spelling of 21000040350 in words is "twenty-one billion, forty thousand, three hundred fifty".