21012200726 has 16 divisors (see below), whose sum is σ = 34386161040. Its totient is φ = 9550289280.

The previous prime is 21012200717. The next prime is 21012200761. The reversal of 21012200726 is 62700221012.

It is a happy number.

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, 368930 + ... + 422058.

It is an arithmetic number, because the mean of its divisors is an integer number (2149135065).

Almost surely, 2^21012200726 is an apocalyptic number.

21012200726 is a deficient number, since it is larger than the sum of its proper divisors (13373960314).

21012200726 is a wasteful number, since it uses less digits than its factorization.

21012200726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71119.

The product of its (nonzero) digits is 672, while the sum is 23.

Adding to 21012200726 its reverse (62700221012), we get a palindrome (83712421738).

The spelling of 21012200726 in words is "twenty-one billion, twelve million, two hundred thousand, seven hundred twenty-six".