102949821 has 24 divisors (see below), whose sum is σ = 160524000. Its totient is φ = 63203616.

The previous prime is 102949801. The next prime is 102949823. The reversal of 102949821 is 128949201.

It is not a de Polignac number, because 102949821 - 2⁵ = 102949789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102949823) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67930 + ... + 69428.

It is an arithmetic number, because the mean of its divisors is an integer number (6688500).

Almost surely, 2^102949821 is an apocalyptic number.

It is an amenable number.

102949821 is a deficient number, since it is larger than the sum of its proper divisors (57574179).

102949821 is a wasteful number, since it uses less digits than its factorization.

102949821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105 (or 2102 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 102949821 is about 10146.4191220351. The cubic root of 102949821 is about 468.6786805628.

The spelling of 102949821 in words is "one hundred two million, nine hundred forty-nine thousand, eight hundred twenty-one".