21002012011 has 8 divisors (see below), whose sum is σ = 21916661760. Its totient is φ = 20087488872.

The previous prime is 21002011999. The next prime is 21002012021. The reversal of 21002012011 is 11021020012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002012011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002012021) 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, 491446 + ... + 532468.

It is an arithmetic number, because the mean of its divisors is an integer number (2739582720).

Almost surely, 2^21002012011 is an apocalyptic number.

21002012011 is a deficient number, since it is larger than the sum of its proper divisors (914649749).

21002012011 is a wasteful number, since it uses less digits than its factorization.

21002012011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63305.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21002012011 its reverse (11021020012), we get a palindrome (32023032023).

The spelling of 21002012011 in words is "twenty-one billion, two million, twelve thousand, eleven".