21100020122 has 8 divisors (see below), whose sum is σ = 32095805472. Its totient is φ = 10401418300.

The previous prime is 21100020107. The next prime is 21100020143. The reversal of 21100020122 is 22102000112.

It is a happy number.

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

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, 74295704 + ... + 74295987.

It is an arithmetic number, because the mean of its divisors is an integer number (4011975684).

Almost surely, 2^21100020122 is an apocalyptic number.

21100020122 is a deficient number, since it is larger than the sum of its proper divisors (10995785350).

21100020122 is a wasteful number, since it uses less digits than its factorization.

21100020122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148591764.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21100020122 its reverse (22102000112), we get a palindrome (43202020234).

The spelling of 21100020122 in words is "twenty-one billion, one hundred million, twenty thousand, one hundred twenty-two".