21032121412 has 12 divisors (see below), whose sum is σ = 36960215040. Its totient is φ = 10472059976.

The previous prime is 21032121379. The next prime is 21032121427. The reversal of 21032121412 is 21412123012.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 21032121412.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10999108 + ... + 11001019.

It is an arithmetic number, because the mean of its divisors is an integer number (3080017920).

Almost surely, 2^21032121412 is an apocalyptic number.

It is an amenable number.

21032121412 is a deficient number, since it is larger than the sum of its proper divisors (15928093628).

21032121412 is a wasteful number, since it uses less digits than its factorization.

21032121412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22000370 (or 22000368 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21032121412 its reverse (21412123012), we get a palindrome (42444244424).

The spelling of 21032121412 in words is "twenty-one billion, thirty-two million, one hundred twenty-one thousand, four hundred twelve".