21201201022 has 4 divisors (see below), whose sum is σ = 31801801536. Its totient is φ = 10600600510.

The previous prime is 21201200987. The next prime is 21201201061. The reversal of 21201201022 is 22010210212.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21201200993 and 21201201011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300300254 + ... + 5300300257.

It is an arithmetic number, because the mean of its divisors is an integer number (7950450384).

Almost surely, 2^21201201022 is an apocalyptic number.

21201201022 is a deficient number, since it is larger than the sum of its proper divisors (10600600514).

21201201022 is a wasteful number, since it uses less digits than its factorization.

21201201022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10600600513.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21201201022 its reverse (22010210212), we get a palindrome (43211411234).

The spelling of 21201201022 in words is "twenty-one billion, two hundred one million, two hundred one thousand, twenty-two".