21122021011 has 16 divisors (see below), whose sum is σ = 26146620864. Its totient is φ = 16615315584.

The previous prime is 21122021003. The next prime is 21122021029. The reversal of 21122021011 is 11012022112.

It is not a de Polignac number, because 21122021011 - 2³ = 21122021003 is a prime.

It is a super-2 number, since 2×21122021011² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 21122020982 and 21122021000.

It is not an unprimeable number, because it can be changed into a prime (21122021911) 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, 655096 + ... + 686581.

It is an arithmetic number, because the mean of its divisors is an integer number (1634163804).

Almost surely, 2^21122021011 is an apocalyptic number.

21122021011 is a deficient number, since it is larger than the sum of its proper divisors (5024599853).

21122021011 is a wasteful number, since it uses less digits than its factorization.

21122021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341870.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21122021011 its reverse (11012022112), we get a palindrome (32134043123).

The spelling of 21122021011 in words is "twenty-one billion, one hundred twenty-two million, twenty-one thousand, eleven".