21051047810 has 64 divisors (see below), whose sum is σ = 43434123264. Its totient is φ = 7277030400.

The previous prime is 21051047783. The next prime is 21051047821. The reversal of 21051047810 is 1874015012.

It is a super-2 number, since 2×21051047810² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 397175 + ... + 447045.

It is an arithmetic number, because the mean of its divisors is an integer number (678658176).

Almost surely, 2^21051047810 is an apocalyptic number.

21051047810 is an abundant number, since it is smaller than the sum of its proper divisors (22383075454).

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

21051047810 is a wasteful number, since it uses less digits than its factorization.

21051047810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50099.

The product of its (nonzero) digits is 2240, while the sum is 29.

The spelling of 21051047810 in words is "twenty-one billion, fifty-one million, forty-seven thousand, eight hundred ten".