21403501212 has 48 divisors (see below), whose sum is σ = 50122800000. Its totient is φ = 7108651200.

The previous prime is 21403501187. The next prime is 21403501237. The reversal of 21403501212 is 21210530412.

It is an interprime number because it is at equal distance from previous prime (21403501187) and next prime (21403501237).

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, 4195039 + ... + 4200137.

It is an arithmetic number, because the mean of its divisors is an integer number (1044225000).

Almost surely, 2^21403501212 is an apocalyptic number.

It is an amenable number.

21403501212 is an abundant number, since it is smaller than the sum of its proper divisors (28719298788).

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

21403501212 is a wasteful number, since it uses less digits than its factorization.

21403501212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6306 (or 6304 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The spelling of 21403501212 in words is "twenty-one billion, four hundred three million, five hundred one thousand, two hundred twelve".