21221001102 has 32 divisors (see below), whose sum is σ = 48532983552. Its totient is φ = 6059663424.

The previous prime is 21221001101. The next prime is 21221001103. The reversal of 21221001102 is 20110012212.

It is an interprime number because it is at equal distance from previous prime (21221001101) and next prime (21221001103).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221001101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70488 + ... + 217739.

It is an arithmetic number, because the mean of its divisors is an integer number (1516655736).

Almost surely, 2^21221001102 is an apocalyptic number.

21221001102 is an abundant number, since it is smaller than the sum of its proper divisors (27311982450).

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

21221001102 is a wasteful number, since it uses less digits than its factorization.

21221001102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289992.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21221001102 its reverse (20110012212), we get a palindrome (41331013314).

The spelling of 21221001102 in words is "twenty-one billion, two hundred twenty-one million, one thousand, one hundred two".