21211436426423 has 16 divisors (see below), whose sum is σ = 22251015653760. Its totient is φ = 20196509389056.

The previous prime is 21211436426419. The next prime is 21211436426491. The reversal of 21211436426423 is 32462463411212.

It is a cyclic number.

It is not a de Polignac number, because 21211436426423 - 2² = 21211436426419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211436426023) 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, 13166165 + ... + 14689137.

It is an arithmetic number, because the mean of its divisors is an integer number (1390688478360).

Almost surely, 2^{21211436426423} is an apocalyptic number.

21211436426423 is a deficient number, since it is larger than the sum of its proper divisors (1039579227337).

21211436426423 is a wasteful number, since it uses less digits than its factorization.

21211436426423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531066.

The product of its digits is 331776, while the sum is 41.

Adding to 21211436426423 its reverse (32462463411212), we get a palindrome (53673899837635).

The spelling of 21211436426423 in words is "twenty-one trillion, two hundred eleven billion, four hundred thirty-six million, four hundred twenty-six thousand, four hundred twenty-three".