21651167015 has 8 divisors (see below), whose sum is σ = 26233647648. Its totient is φ = 17152768800.

The previous prime is 21651167011. The next prime is 21651167081. The reversal of 21651167015 is 51076115612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21651167015 - 2² = 21651167011 is a prime.

It is a super-2 number, since 2×21651167015² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21651167011) 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, 21020036 + ... + 21021065.

It is an arithmetic number, because the mean of its divisors is an integer number (3279205956).

Almost surely, 2^21651167015 is an apocalyptic number.

21651167015 is a deficient number, since it is larger than the sum of its proper divisors (4582480633).

21651167015 is a wasteful number, since it uses less digits than its factorization.

21651167015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42041209.

The product of its (nonzero) digits is 12600, while the sum is 35.

The spelling of 21651167015 in words is "twenty-one billion, six hundred fifty-one million, one hundred sixty-seven thousand, fifteen".