21002022011 has 16 divisors (see below), whose sum is σ = 21789081600. Its totient is φ = 20222019360.

The previous prime is 21002021981. The next prime is 21002022059. The reversal of 21002022011 is 11022020012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21002022011 - 2¹⁴ = 21002005627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21002021983 and 21002022001.

It is not an unprimeable number, because it can be changed into a prime (21002022211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12628166 + ... + 12629828.

It is an arithmetic number, because the mean of its divisors is an integer number (1361817600).

Almost surely, 2^21002022011 is an apocalyptic number.

21002022011 is a deficient number, since it is larger than the sum of its proper divisors (787059589).

21002022011 is a wasteful number, since it uses less digits than its factorization.

21002022011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3506.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21002022011 its reverse (11022020012), we get a palindrome (32024042023).

The spelling of 21002022011 in words is "twenty-one billion, two million, twenty-two thousand, eleven".