1220102100021 has 64 divisors (see below), whose sum is σ = 1928949078528. Its totient is φ = 671447605248.

The previous prime is 1220102100011. The next prime is 1220102100023. The reversal of 1220102100021 is 1200012010221.

It is not a de Polignac number, because 1220102100021 - 2¹³ = 1220102091829 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220102100023) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 67861185 + ... + 67879161.

It is an arithmetic number, because the mean of its divisors is an integer number (30139829352).

Almost surely, 2^{1220102100021} is an apocalyptic number.

It is an amenable number.

1220102100021 is a deficient number, since it is larger than the sum of its proper divisors (708846978507).

1220102100021 is a wasteful number, since it uses less digits than its factorization.

1220102100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18910.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1220102100021 its reverse (1200012010221), we get a palindrome (2420114110242).

The spelling of 1220102100021 in words is "one trillion, two hundred twenty billion, one hundred two million, one hundred thousand, twenty-one".