21022012 has 48 divisors (see below), whose sum is σ = 42223104. Its totient is φ = 9072000.

The previous prime is 21022009. The next prime is 21022021.

21022012 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 21022012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77437 + ... + 77707.

It is an arithmetic number, because the mean of its divisors is an integer number (879648).

Almost surely, 2^21022012 is an apocalyptic number.

21022012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21022012 is an abundant number, since it is smaller than the sum of its proper divisors (21201092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21022012 is a wasteful number, since it uses less digits than its factorization.

21022012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21022012 is about 4584.9767720240. The cubic root of 21022012 is about 275.9887799122.

It can be divided in two parts, 2102 and 2012, that multiplied together give a palindrome (4229224).

The spelling of 21022012 in words is "twenty-one million, twenty-two thousand, twelve".