1021102155 has 12 divisors (see below), whose sum is σ = 1769910480. Its totient is φ = 544587792.

The previous prime is 1021102141. The next prime is 1021102157. The reversal of 1021102155 is 5512011201.

It is not a de Polignac number, because 1021102155 - 2¹³ = 1021093963 is a prime.

It is a super-2 number, since 2×1021102155² = 2085299221891288050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1021102157) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11345535 + ... + 11345624.

It is an arithmetic number, because the mean of its divisors is an integer number (147492540).

Almost surely, 2^1021102155 is an apocalyptic number.

1021102155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1021102155 is a deficient number, since it is larger than the sum of its proper divisors (748808325).

1021102155 is a wasteful number, since it uses less digits than its factorization.

1021102155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22691170 (or 22691167 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 1021102155 is about 31954.6890925260. The cubic root of 1021102155 is about 1006.9851457978.

Adding to 1021102155 its reverse (5512011201), we get a palindrome (6533113356).

The spelling of 1021102155 in words is "one billion, twenty-one million, one hundred two thousand, one hundred fifty-five".