21155166150416 has 10 divisors (see below), whose sum is σ = 40988134416462. Its totient is φ = 10577583075200.

The previous prime is 21155166150401. The next prime is 21155166150431. The reversal of 21155166150416 is 61405166155112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21155166150401) and next prime (21155166150431).

It can be written as a sum of positive squares in only one way, i.e., 21057819654400 + 97346496016 = 4588880^2 + 312004^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661098942185 + ... + 661098942216.

Almost surely, 2^{21155166150416} is an apocalyptic number.

It is an amenable number.

21155166150416 is a deficient number, since it is larger than the sum of its proper divisors (19832968266046).

21155166150416 is a wasteful number, since it uses less digits than its factorization.

21155166150416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322197884409 (or 1322197884403 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 44.

The spelling of 21155166150416 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred sixty-six million, one hundred fifty thousand, four hundred sixteen".