21002011122011 has 8 divisors (see below), whose sum is σ = 21082297800960. Its totient is φ = 20921727709672.

The previous prime is 21002011121953. The next prime is 21002011122019. The reversal of 21002011122011 is 11022111020012.

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

It is a cyclic number.

It is not a de Polignac number, because 21002011122011 - 2¹⁸ = 21002010859867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002011122019) 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, 12479426 + ... + 14062008.

It is an arithmetic number, because the mean of its divisors is an integer number (2635287225120).

Almost surely, 2^{21002011122011} is an apocalyptic number.

21002011122011 is a deficient number, since it is larger than the sum of its proper divisors (80286678949).

21002011122011 is a wasteful number, since it uses less digits than its factorization.

21002011122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633305.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21002011122011 its reverse (11022111020012), we get a palindrome (32024122142023).

The spelling of 21002011122011 in words is "twenty-one trillion, two billion, eleven million, one hundred twenty-two thousand, eleven".