21401201420 has 24 divisors (see below), whose sum is σ = 44986584048. Its totient is φ = 8552088000.

The previous prime is 21401201411. The next prime is 21401201429. The reversal of 21401201420 is 2410210412.

It is an interprime number because it is at equal distance from previous prime (21401201411) and next prime (21401201429).

It is a super-2 number, since 2×21401201420² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21401201429) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 503606 + ... + 544445.

It is an arithmetic number, because the mean of its divisors is an integer number (1874441002).

Almost surely, 2^21401201420 is an apocalyptic number.

21401201420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21401201420 is an abundant number, since it is smaller than the sum of its proper divisors (23585382628).

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

21401201420 is a wasteful number, since it uses less digits than its factorization.

21401201420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049081 (or 1049079 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21401201420 its reverse (2410210412), we get a palindrome (23811411832).

The spelling of 21401201420 in words is "twenty-one billion, four hundred one million, two hundred one thousand, four hundred twenty".