21151355415 has 8 divisors (see below), whose sum is σ = 33842168688. Its totient is φ = 11280722880.

The previous prime is 21151355411. The next prime is 21151355417. The reversal of 21151355415 is 51455315112.

It is a happy number.

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

It is not a de Polignac number, because 21151355415 - 2² = 21151355411 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21151355411) 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, 705045166 + ... + 705045195.

It is an arithmetic number, because the mean of its divisors is an integer number (4230271086).

Almost surely, 2^21151355415 is an apocalyptic number.

21151355415 is a deficient number, since it is larger than the sum of its proper divisors (12690813273).

21151355415 is a wasteful number, since it uses less digits than its factorization.

21151355415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410090369.

The product of its digits is 15000, while the sum is 33.

The spelling of 21151355415 in words is "twenty-one billion, one hundred fifty-one million, three hundred fifty-five thousand, four hundred fifteen".