21421401401 has 8 divisors (see below), whose sum is σ = 22563602400. Its totient is φ = 20280676320.

The previous prime is 21421401343. The next prime is 21421401427. The reversal of 21421401401 is 10410412412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21421401401 - 2²⁶ = 21354292537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21421406401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339116 + ... + 397293.

It is an arithmetic number, because the mean of its divisors is an integer number (2820450300).

Almost surely, 2^21421401401 is an apocalyptic number.

It is an amenable number.

21421401401 is a deficient number, since it is larger than the sum of its proper divisors (1142200999).

21421401401 is a wasteful number, since it uses less digits than its factorization.

21421401401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737959.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21421401401 its reverse (10410412412), we get a palindrome (31831813813).

The spelling of 21421401401 in words is "twenty-one billion, four hundred twenty-one million, four hundred one thousand, four hundred one".