21930102 has 40 divisors (see below), whose sum is σ = 52036776. Its totient is φ = 6879168.

The previous prime is 21930101. The next prime is 21930107. The reversal of 21930102 is 20103912.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21930101) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1228 + ... + 6735.

Almost surely, 2^21930102 is an apocalyptic number.

21930102 is an abundant number, since it is smaller than the sum of its proper divisors (30106674).

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

21930102 is a wasteful number, since it uses less digits than its factorization.

21930102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7994 (or 7985 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 21930102 is about 4682.9586801508. The cubic root of 21930102 is about 279.9068652831.

The spelling of 21930102 in words is "twenty-one million, nine hundred thirty thousand, one hundred two".