21012003130 has 16 divisors (see below), whose sum is σ = 37865753640. Its totient is φ = 8394990592.

The previous prime is 21012003101. The next prime is 21012003137. The reversal of 21012003130 is 3130021012.

It can be written as a sum of positive squares in 4 ways, for example, as 20944746729 + 67256401 = 144723^2 + 8201^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21012003130.

It is not an unprimeable number, because it can be changed into a prime (21012003137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1217335 + ... + 1234474.

Almost surely, 2^21012003130 is an apocalyptic number.

21012003130 is a deficient number, since it is larger than the sum of its proper divisors (16853750510).

21012003130 is a wasteful number, since it uses less digits than its factorization.

21012003130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2452673.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21012003130 its reverse (3130021012), we get a palindrome (24142024142).

The spelling of 21012003130 in words is "twenty-one billion, twelve million, three thousand, one hundred thirty".