21214091500 has 48 divisors (see below), whose sum is σ = 52950381120. Its totient is φ = 7273401600.

The previous prime is 21214091473. The next prime is 21214091501. The reversal of 21214091500 is 519041212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21214091501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3027085 + ... + 3034084.

It is an arithmetic number, because the mean of its divisors is an integer number (1103132940).

Almost surely, 2^21214091500 is an apocalyptic number.

21214091500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21214091500 is an abundant number, since it is smaller than the sum of its proper divisors (31736289620).

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

21214091500 is a wasteful number, since it uses less digits than its factorization.

21214091500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6061195 (or 6061183 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The spelling of 21214091500 in words is "twenty-one billion, two hundred fourteen million, ninety-one thousand, five hundred".