21142340401 has 16 divisors (see below), whose sum is σ = 26120312064. Its totient is φ = 16664382144.

The previous prime is 21142340381. The next prime is 21142340407. The reversal of 21142340401 is 10404324112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21142340401 - 2⁵ = 21142340369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21142340407) 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, 417766 + ... + 465631.

It is an arithmetic number, because the mean of its divisors is an integer number (1632519504).

Almost surely, 2^21142340401 is an apocalyptic number.

It is an amenable number.

21142340401 is a deficient number, since it is larger than the sum of its proper divisors (4977971663).

21142340401 is a wasteful number, since it uses less digits than its factorization.

21142340401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883680.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21142340401 its reverse (10404324112), we get a palindrome (31546664513).

The spelling of 21142340401 in words is "twenty-one billion, one hundred forty-two million, three hundred forty thousand, four hundred one".