21421343100 has 36 divisors (see below), whose sum is σ = 61979086904. Its totient is φ = 5712358080.

The previous prime is 21421343023. The next prime is 21421343101. The reversal of 21421343100 is 134312412.

It is a super-2 number, since 2×21421343100² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421343101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35701939 + ... + 35702538.

Almost surely, 2^21421343100 is an apocalyptic number.

21421343100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21421343100 is an abundant number, since it is smaller than the sum of its proper divisors (40557743804).

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

21421343100 is a wasteful number, since it uses less digits than its factorization.

21421343100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71404494 (or 71404487 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21421343100 its reverse (134312412), we get a palindrome (21555655512).

The spelling of 21421343100 in words is "twenty-one billion, four hundred twenty-one million, three hundred forty-three thousand, one hundred".