21010203400 has 24 divisors (see below), whose sum is σ = 48848723370. Its totient is φ = 8404081280.

The previous prime is 21010203391. The next prime is 21010203419. The reversal of 21010203400 is 430201012.

It can be written as a sum of positive squares in 3 ways, for example, as 16707630564 + 4302572836 = 129258^2 + 65594^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52525309 + ... + 52525708.

Almost surely, 2^21010203400 is an apocalyptic number.

21010203400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010203400 is an abundant number, since it is smaller than the sum of its proper divisors (27838519970).

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

21010203400 is a wasteful number, since it uses less digits than its factorization.

21010203400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105051033 (or 105051024 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21010203400 its reverse (430201012), we get a palindrome (21440404412).

The spelling of 21010203400 in words is "twenty-one billion, ten million, two hundred three thousand, four hundred".