21021002022111 has 64 divisors (see below), whose sum is σ = 35997105758208. Its totient is φ = 10605538044288.

The previous prime is 21021002022109. The next prime is 21021002022127. The reversal of 21021002022111 is 11122020012012.

It is not a de Polignac number, because 21021002022111 - 2¹ = 21021002022109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021002042111) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 289720740 + ... + 289793286.

It is an arithmetic number, because the mean of its divisors is an integer number (562454777472).

Almost surely, 2^{21021002022111} is an apocalyptic number.

21021002022111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21021002022111 is a deficient number, since it is larger than the sum of its proper divisors (14976103736097).

21021002022111 is a wasteful number, since it uses less digits than its factorization.

21021002022111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118740.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21021002022111 its reverse (11122020012012), we get a palindrome (32143022034123).

The spelling of 21021002022111 in words is "twenty-one trillion, twenty-one billion, two million, twenty-two thousand, one hundred eleven".