1020212111621 has 2 divisors, whose sum is σ = 1020212111622. Its totient is φ = 1020212111620.

The previous prime is 1020212111609. The next prime is 1020212111647. The reversal of 1020212111621 is 1261112120201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 673425390625 + 346786720996 = 820625^2 + 588886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020212111621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1020212111593 and 1020212111602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020212111651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510106055810 + 510106055811.

It is an arithmetic number, because the mean of its divisors is an integer number (510106055811).

Almost surely, 2^{1020212111621} is an apocalyptic number.

It is an amenable number.

1020212111621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020212111621 is an equidigital number, since it uses as much as digits as its factorization.

1020212111621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 1020212111621 its reverse (1261112120201), we get a palindrome (2281324231822).

The spelling of 1020212111621 in words is "one trillion, twenty billion, two hundred twelve million, one hundred eleven thousand, six hundred twenty-one".