21406216510 has 32 divisors (see below), whose sum is σ = 44107104960. Its totient is φ = 7327364352.

The previous prime is 21406216499. The next prime is 21406216547. The reversal of 21406216510 is 1561260412.

It is a super-2 number, since 2×21406216510² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 204625 + ... + 291004.

It is an arithmetic number, because the mean of its divisors is an integer number (1378347030).

Almost surely, 2^21406216510 is an apocalyptic number.

21406216510 is an abundant number, since it is smaller than the sum of its proper divisors (22700888450).

21406216510 is a wasteful number, since it uses less digits than its factorization.

21406216510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496260.

The product of its (nonzero) digits is 2880, while the sum is 28.

Adding to 21406216510 its reverse (1561260412), we get a palindrome (22967476922).

The spelling of 21406216510 in words is "twenty-one billion, four hundred six million, two hundred sixteen thousand, five hundred ten".