21421122102 has 48 divisors (see below), whose sum is σ = 50470778592. Its totient is φ = 6538717440.

The previous prime is 21421122097. The next prime is 21421122143. The reversal of 21421122102 is 20122112412.

21421122102 is a `hidden beast` number, since 21 + 421 + 1 + 221 + 0 + 2 = 666.

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

It is a congruent number.

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, 934674 + ... + 957317.

It is an arithmetic number, because the mean of its divisors is an integer number (1051474554).

Almost surely, 2^21421122102 is an apocalyptic number.

21421122102 is an abundant number, since it is smaller than the sum of its proper divisors (29049656490).

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

21421122102 is a wasteful number, since it uses less digits than its factorization.

21421122102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892053 (or 1892050 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21421122102 its reverse (20122112412), we get a palindrome (41543234514).

The spelling of 21421122102 in words is "twenty-one billion, four hundred twenty-one million, one hundred twenty-two thousand, one hundred two".