21012011102 has 16 divisors (see below), whose sum is σ = 32669049600. Its totient is φ = 10129000728.

The previous prime is 21012011093. The next prime is 21012011143. The reversal of 21012011102 is 20111021012.

It is a super-2 number, since 2×21012011102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1661852 + ... + 1674447.

It is an arithmetic number, because the mean of its divisors is an integer number (2041815600).

Almost surely, 2^21012011102 is an apocalyptic number.

21012011102 is a deficient number, since it is larger than the sum of its proper divisors (11657038498).

21012011102 is a wasteful number, since it uses less digits than its factorization.

21012011102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3336415.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21012011102 its reverse (20111021012), we get a palindrome (41123032114).

The spelling of 21012011102 in words is "twenty-one billion, twelve million, eleven thousand, one hundred two".