1020012001221 has 16 divisors (see below), whose sum is σ = 1394976556800. Its totient is φ = 662699943360.

The previous prime is 1020012001219. The next prime is 1020012001259. The reversal of 1020012001221 is 1221002100201.

It is not a de Polignac number, because 1020012001221 - 2¹ = 1020012001219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1020012001197 and 1020012001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020012000221) 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, 21503725 + ... + 21551106.

It is an arithmetic number, because the mean of its divisors is an integer number (87186034800).

Almost surely, 2^{1020012001221} is an apocalyptic number.

It is an amenable number.

1020012001221 is a deficient number, since it is larger than the sum of its proper divisors (374964555579).

1020012001221 is a wasteful number, since it uses less digits than its factorization.

1020012001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43055036.

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

Adding to 1020012001221 its reverse (1221002100201), we get a palindrome (2241014101422).

The spelling of 1020012001221 in words is "one trillion, twenty billion, twelve million, one thousand, two hundred twenty-one".