21421037112 has 32 divisors (see below), whose sum is σ = 53664422400. Its totient is φ = 7125435104.

The previous prime is 21421037101. The next prime is 21421037147. The reversal of 21421037112 is 21173012412.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 920178 + ... + 943169.

It is an arithmetic number, because the mean of its divisors is an integer number (1677013200).

Almost surely, 2^21421037112 is an apocalyptic number.

It is an amenable number.

21421037112 is an abundant number, since it is smaller than the sum of its proper divisors (32243385288).

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

21421037112 is a wasteful number, since it uses less digits than its factorization.

21421037112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863835 (or 1863831 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

Adding to 21421037112 its reverse (21173012412), we get a palindrome (42594049524).

The spelling of 21421037112 in words is "twenty-one billion, four hundred twenty-one million, thirty-seven thousand, one hundred twelve".