21001413401420 has 48 divisors (see below), whose sum is σ = 44710613303328. Its totient is φ = 8284841418240.

The previous prime is 21001413401411. The next prime is 21001413401467. The reversal of 21001413401420 is 2410431410012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18338087 + ... + 19449633.

It is an arithmetic number, because the mean of its divisors is an integer number (931471110486).

Almost surely, 2^{21001413401420} is an apocalyptic number.

21001413401420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001413401420 is an abundant number, since it is smaller than the sum of its proper divisors (23709199901908).

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

21001413401420 is a wasteful number, since it uses less digits than its factorization.

21001413401420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124570 (or 1124568 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21001413401420 its reverse (2410431410012), we get a palindrome (23411844811432).

The spelling of 21001413401420 in words is "twenty-one trillion, one billion, four hundred thirteen million, four hundred one thousand, four hundred twenty".