21012011007 has 16 divisors (see below), whose sum is σ = 30596041728. Its totient is φ = 12748347360.

The previous prime is 21012010967. The next prime is 21012011051. The reversal of 21012011007 is 70011021012.

It is not a de Polignac number, because 21012011007 - 2¹⁴ = 21011994623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012091007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3791383 + ... + 3796920.

It is an arithmetic number, because the mean of its divisors is an integer number (1912252608).

Almost surely, 2^21012011007 is an apocalyptic number.

21012011007 is a deficient number, since it is larger than the sum of its proper divisors (9584030721).

21012011007 is a wasteful number, since it uses less digits than its factorization.

21012011007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7588390.

The product of its (nonzero) digits is 28, while the sum is 15.

Adding to 21012011007 its reverse (70011021012), we get a palindrome (91023032019).

The spelling of 21012011007 in words is "twenty-one billion, twelve million, eleven thousand, seven".