21400102 has 4 divisors (see below), whose sum is σ = 32100156. Its totient is φ = 10700050.

The previous prime is 21400091. The next prime is 21400103. The reversal of 21400102 is 20100412.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21400102² = 915928731220808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5350024 + ... + 5350027.

It is an arithmetic number, because the mean of its divisors is an integer number (8025039).

Almost surely, 2^21400102 is an apocalyptic number.

21400102 is a deficient number, since it is larger than the sum of its proper divisors (10700054).

21400102 is a wasteful number, since it uses less digits than its factorization.

21400102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10700053.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21400102 is about 4626.0244270864. The cubic root of 21400102 is about 277.6335509532.

Adding to 21400102 its reverse (20100412), we get a palindrome (41500514).

The spelling of 21400102 in words is "twenty-one million, four hundred thousand, one hundred two".