21223742100 has 72 divisors (see below), whose sum is σ = 66989858208. Its totient is φ = 5145148800.

The previous prime is 21223742093. The next prime is 21223742101. The reversal of 21223742100 is 124732212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223742101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3212419 + ... + 3219018.

Almost surely, 2^21223742100 is an apocalyptic number.

21223742100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21223742100 is an abundant number, since it is smaller than the sum of its proper divisors (45766116108).

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

21223742100 is a wasteful number, since it uses less digits than its factorization.

21223742100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6431465 (or 6431458 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The spelling of 21223742100 in words is "twenty-one billion, two hundred twenty-three million, seven hundred forty-two thousand, one hundred".