215115311620106 has 4 divisors (see below), whose sum is σ = 322672967430162. Its totient is φ = 107557655810052.

The previous prime is 215115311620063. The next prime is 215115311620133. The reversal of 215115311620106 is 601026113511512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 113468406144025 + 101646905476081 = 10652155^2 + 10082009^2 .

It is a super-2 number, since 2×215115311620106² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53778827905025 + ... + 53778827905028.

Almost surely, 2^{215115311620106} is an apocalyptic number.

215115311620106 is a deficient number, since it is larger than the sum of its proper divisors (107557655810056).

215115311620106 is a wasteful number, since it uses less digits than its factorization.

215115311620106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107557655810055.

The product of its (nonzero) digits is 10800, while the sum is 35.

The spelling of 215115311620106 in words is "two hundred fifteen trillion, one hundred fifteen billion, three hundred eleven million, six hundred twenty thousand, one hundred six".