21222741700 has 144 divisors (see below), whose sum is σ = 48956866560. Its totient is φ = 7969104000.

The previous prime is 21222741679. The next prime is 21222741703. The reversal of 21222741700 is 714722212.

It is not an unprimeable number, because it can be changed into a prime (21222741703) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49240485 + ... + 49240915.

It is an arithmetic number, because the mean of its divisors is an integer number (339978240).

Almost surely, 2^21222741700 is an apocalyptic number.

21222741700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222741700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24478433280).

21222741700 is an abundant number, since it is smaller than the sum of its proper divisors (27734124860).

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

21222741700 is a wasteful number, since it uses less digits than its factorization.

21222741700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818 (or 811 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The spelling of 21222741700 in words is "twenty-one billion, two hundred twenty-two million, seven hundred forty-one thousand, seven hundred".