21010213435 has 16 divisors (see below), whose sum is σ = 25308499680. Its totient is φ = 16744124160.

The previous prime is 21010213423. The next prime is 21010213481. The reversal of 21010213435 is 53431201012.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21010213435 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1574140 + ... + 1587430.

It is an arithmetic number, because the mean of its divisors is an integer number (1581781230).

Almost surely, 2^21010213435 is an apocalyptic number.

21010213435 is a deficient number, since it is larger than the sum of its proper divisors (4298286245).

21010213435 is a wasteful number, since it uses less digits than its factorization.

21010213435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14478.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21010213435 its reverse (53431201012), we get a palindrome (74441414447).

The spelling of 21010213435 in words is "twenty-one billion, ten million, two hundred thirteen thousand, four hundred thirty-five".