215042106621 has 8 divisors (see below), whose sum is σ = 287037546624. Its totient is φ = 143204035520.

The previous prime is 215042106569. The next prime is 215042106649. The reversal of 215042106621 is 126601240512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215042106621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215042106661) 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, 39339036 + ... + 39344501.

It is an arithmetic number, because the mean of its divisors is an integer number (35879693328).

Almost surely, 2^215042106621 is an apocalyptic number.

It is an amenable number.

215042106621 is a deficient number, since it is larger than the sum of its proper divisors (71995440003).

215042106621 is an equidigital number, since it uses as much as digits as its factorization.

215042106621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78684451.

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 215042106621 in words is "two hundred fifteen billion, forty-two million, one hundred six thousand, six hundred twenty-one".