21063213420 has 48 divisors (see below), whose sum is σ = 62081053440. Its totient is φ = 5321232576.

The previous prime is 21063213397. The next prime is 21063213449. The reversal of 21063213420 is 2431236012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9237112 + ... + 9239391.

It is an arithmetic number, because the mean of its divisors is an integer number (1293355280).

Almost surely, 2^21063213420 is an apocalyptic number.

21063213420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21063213420 is an abundant number, since it is smaller than the sum of its proper divisors (41017840020).

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

21063213420 is a wasteful number, since it uses less digits than its factorization.

21063213420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18476534 (or 18476532 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21063213420 its reverse (2431236012), we get a palindrome (23494449432).

The spelling of 21063213420 in words is "twenty-one billion, sixty-three million, two hundred thirteen thousand, four hundred twenty".