21111022101 has 16 divisors (see below), whose sum is σ = 30958228224. Its totient is φ = 12714984384.

The previous prime is 21111022087. The next prime is 21111022111. The reversal of 21111022101 is 10122011112.

It is not a de Polignac number, because 21111022101 - 2¹⁴ = 21111005717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111022111) 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, 5756766 + ... + 5760431.

It is an arithmetic number, because the mean of its divisors is an integer number (1934889264).

Almost surely, 2^21111022101 is an apocalyptic number.

It is an amenable number.

21111022101 is a deficient number, since it is larger than the sum of its proper divisors (9847206123).

21111022101 is a wasteful number, since it uses less digits than its factorization.

21111022101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11517260.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21111022101 its reverse (10122011112), we get a palindrome (31233033213).

The spelling of 21111022101 in words is "twenty-one billion, one hundred eleven million, twenty-two thousand, one hundred one".