21425211401 has 16 divisors (see below), whose sum is σ = 24854102208. Its totient is φ = 18253017600.

The previous prime is 21425211389. The next prime is 21425211407. The reversal of 21425211401 is 10411252412.

It is a cyclic number.

It is not a de Polignac number, because 21425211401 - 2³⁴ = 4245342217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21425211407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202295 + ... + 289436.

It is an arithmetic number, because the mean of its divisors is an integer number (1553381388).

Almost surely, 2^21425211401 is an apocalyptic number.

It is an amenable number.

21425211401 is a deficient number, since it is larger than the sum of its proper divisors (3428890807).

21425211401 is a wasteful number, since it uses less digits than its factorization.

21425211401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491992.

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 21425211401 its reverse (10411252412), we get a palindrome (31836463813).

The spelling of 21425211401 in words is "twenty-one billion, four hundred twenty-five million, two hundred eleven thousand, four hundred one".