21213406225403 has 8 divisors (see below), whose sum is σ = 24256836727008. Its totient is φ = 18173211698304.

The previous prime is 21213406225369. The next prime is 21213406225433. The reversal of 21213406225403 is 30452260431212.

It is a happy number.

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 21213406225403 - 2¹⁶ = 21213406159867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213406225433) 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, 808979576 + ... + 809005797.

It is an arithmetic number, because the mean of its divisors is an integer number (3032104590876).

Almost surely, 2^{21213406225403} is an apocalyptic number.

21213406225403 is a deficient number, since it is larger than the sum of its proper divisors (3043430501605).

21213406225403 is a wasteful number, since it uses less digits than its factorization.

21213406225403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617987253.

The product of its (nonzero) digits is 69120, while the sum is 35.

Adding to 21213406225403 its reverse (30452260431212), we get a palindrome (51665666656615).

The spelling of 21213406225403 in words is "twenty-one trillion, two hundred thirteen billion, four hundred six million, two hundred twenty-five thousand, four hundred three".