21207002201 has 24 divisors (see below), whose sum is σ = 27142903872. Its totient is φ = 16213111200.

The previous prime is 21207002197. The next prime is 21207002309. The reversal of 21207002201 is 10220070212.

It is not a de Polignac number, because 21207002201 - 2² = 21207002197 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21207002201.

It is not an unprimeable number, because it can be changed into a prime (21207004201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191315 + ... + 281096.

It is an arithmetic number, because the mean of its divisors is an integer number (1130954328).

Almost surely, 2^21207002201 is an apocalyptic number.

It is an amenable number.

21207002201 is a deficient number, since it is larger than the sum of its proper divisors (5935901671).

21207002201 is a wasteful number, since it uses less digits than its factorization.

21207002201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472493 (or 472482 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

Adding to 21207002201 its reverse (10220070212), we get a palindrome (31427072413).

The spelling of 21207002201 in words is "twenty-one billion, two hundred seven million, two thousand, two hundred one".