21151354206 has 32 divisors (see below), whose sum is σ = 42930736128. Its totient is φ = 6946433280.

The previous prime is 21151354181. The next prime is 21151354297. The reversal of 21151354206 is 60245315112.

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, 48301 + ... + 211271.

It is an arithmetic number, because the mean of its divisors is an integer number (1341585504).

Almost surely, 2^21151354206 is an apocalyptic number.

21151354206 is an abundant number, since it is smaller than the sum of its proper divisors (21779381922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21151354206 is a wasteful number, since it uses less digits than its factorization.

21151354206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163296.

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 21151354206 its reverse (60245315112), we get a palindrome (81396669318).

The spelling of 21151354206 in words is "twenty-one billion, one hundred fifty-one million, three hundred fifty-four thousand, two hundred six".