21122102012 has 24 divisors (see below), whose sum is σ = 40338081840. Its totient is φ = 9597605760.

The previous prime is 21122102009. The next prime is 21122102083. The reversal of 21122102012 is 21020122112.

It is a super-2 number, since 2×21122102012² (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, 46064 + ... + 210632.

It is an arithmetic number, because the mean of its divisors is an integer number (1680753410).

Almost surely, 2^21122102012 is an apocalyptic number.

21122102012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21122102012 is a deficient number, since it is larger than the sum of its proper divisors (19215979828).

21122102012 is a wasteful number, since it uses less digits than its factorization.

21122102012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167501 (or 167499 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21122102012 its reverse (21020122112), we get a palindrome (42142224124).

It can be divided in two parts, 2112 and 2102012, that multiplied together give a palindrome (4439449344).

The spelling of 21122102012 in words is "twenty-one billion, one hundred twenty-two million, one hundred two thousand, twelve".