21040143212 has 12 divisors (see below), whose sum is σ = 40167546216. Its totient is φ = 9563701440.

The previous prime is 21040143197. The next prime is 21040143217. The reversal of 21040143212 is 21234104012.

It is not an unprimeable number, because it can be changed into a prime (21040143217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239092493 + ... + 239092580.

It is an arithmetic number, because the mean of its divisors is an integer number (3347295518).

Almost surely, 2^21040143212 is an apocalyptic number.

21040143212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21040143212 is a deficient number, since it is larger than the sum of its proper divisors (19127403004).

21040143212 is a wasteful number, since it uses less digits than its factorization.

21040143212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478185088 (or 478185086 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21040143212 its reverse (21234104012), we get a palindrome (42274247224).

The spelling of 21040143212 in words is "twenty-one billion, forty million, one hundred forty-three thousand, two hundred twelve".