21012201001 has 16 divisors (see below), whose sum is σ = 23128012800. Its totient is φ = 18931424400.

The previous prime is 21012200983. The next prime is 21012201017. The reversal of 21012201001 is 10010221012.

It is a cyclic number.

It is not a de Polignac number, because 21012201001 - 2¹³ = 21012192809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012201071) 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, 535780 + ... + 573658.

It is an arithmetic number, because the mean of its divisors is an integer number (1445500800).

Almost surely, 2^21012201001 is an apocalyptic number.

It is an amenable number.

21012201001 is a deficient number, since it is larger than the sum of its proper divisors (2115811799).

21012201001 is a wasteful number, since it uses less digits than its factorization.

21012201001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38340.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21012201001 its reverse (10010221012), we get a palindrome (31022422013).

The spelling of 21012201001 in words is "twenty-one billion, twelve million, two hundred one thousand, one".