21221001212010 has 16 divisors (see below), whose sum is σ = 50930402908896. Its totient is φ = 5658933656528.

The previous prime is 21221001211979. The next prime is 21221001212023. The reversal of 21221001212010 is 1021210012212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353683353504 + ... + 353683353563.

It is an arithmetic number, because the mean of its divisors is an integer number (3183150181806).

Almost surely, 2^{21221001212010} is an apocalyptic number.

21221001212010 is an abundant number, since it is smaller than the sum of its proper divisors (29709401696886).

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

21221001212010 is a wasteful number, since it uses less digits than its factorization.

21221001212010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707366707077.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221001212010 its reverse (1021210012212), we get a palindrome (22242211224222).

The spelling of 21221001212010 in words is "twenty-one trillion, two hundred twenty-one billion, one million, two hundred twelve thousand, ten".