21020102022111 has 8 divisors (see below), whose sum is σ = 28501833250560. Its totient is φ = 13775886070872.

The previous prime is 21020102022107. The next prime is 21020102022149. The reversal of 21020102022111 is 11122020102012.

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

It is not a de Polignac number, because 21020102022111 - 2² = 21020102022107 is a prime.

It is a super-2 number, since 2×21020102022111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020102022511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59378819095 + ... + 59378819448.

It is an arithmetic number, because the mean of its divisors is an integer number (3562729156320).

Almost surely, 2^{21020102022111} is an apocalyptic number.

21020102022111 is a deficient number, since it is larger than the sum of its proper divisors (7481731228449).

21020102022111 is a wasteful number, since it uses less digits than its factorization.

21020102022111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118757638605.

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

Adding to 21020102022111 its reverse (11122020102012), we get a palindrome (32142122124123).

The spelling of 21020102022111 in words is "twenty-one trillion, twenty billion, one hundred two million, twenty-two thousand, one hundred eleven".