21012001002111 has 16 divisors (see below), whose sum is σ = 32018352537600. Its totient is φ = 12006833229408.

The previous prime is 21012001002101. The next prime is 21012001002119. The reversal of 21012001002111 is 11120010021012.

It is not a de Polignac number, because 21012001002111 - 2³³ = 21003411067519 is a prime.

It is a super-2 number, since 2×21012001002111² (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 (21012001002119) 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, 16596610 + ... + 17817728.

It is an arithmetic number, because the mean of its divisors is an integer number (2001147033600).

Almost surely, 2^{21012001002111} is an apocalyptic number.

21012001002111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21012001002111 is a deficient number, since it is larger than the sum of its proper divisors (11006351535489).

21012001002111 is a wasteful number, since it uses less digits than its factorization.

21012001002111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040518.

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

Adding to 21012001002111 its reverse (11120010021012), we get a palindrome (32132011023123).

The spelling of 21012001002111 in words is "twenty-one trillion, twelve billion, one million, two thousand, one hundred eleven".