21221420102 has 8 divisors (see below), whose sum is σ = 31851230616. Its totient is φ = 10604343232.

The previous prime is 21221420021. The next prime is 21221420123. The reversal of 21221420102 is 20102412212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21221420102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3179243 + ... + 3185910.

It is an arithmetic number, because the mean of its divisors is an integer number (3981403827).

Almost surely, 2^21221420102 is an apocalyptic number.

21221420102 is a deficient number, since it is larger than the sum of its proper divisors (10629810514).

21221420102 is a wasteful number, since it uses less digits than its factorization.

21221420102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6366822.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21221420102 its reverse (20102412212), we get a palindrome (41323832314).

The spelling of 21221420102 in words is "twenty-one billion, two hundred twenty-one million, four hundred twenty thousand, one hundred two".