102621402 has 48 divisors (see below), whose sum is σ = 241631208. Its totient is φ = 31288320.

The previous prime is 102621397. The next prime is 102621419. The reversal of 102621402 is 204126201.

102621402 is a `hidden beast` number, since 1 + 0 + 2 + 621 + 40 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 44876601 + 57744801 = 6699^2 + 7599^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24502 + ... + 28382.

Almost surely, 2^102621402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 102621402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120815604).

102621402 is an abundant number, since it is smaller than the sum of its proper divisors (139009806).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102621402 is a wasteful number, since it uses less digits than its factorization.

102621402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4015 (or 4012 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 102621402 is about 10130.2222088165. Note that the first 4 decimals coincide. The cubic root of 102621402 is about 468.1797742388.

Adding to 102621402 its reverse (204126201), we get a palindrome (306747603).

It can be divided in two parts, 10262 and 1402, that added together give a square (11664 = 108²).

The spelling of 102621402 in words is "one hundred two million, six hundred twenty-one thousand, four hundred two".