1021225615501 has 32 divisors (see below), whose sum is σ = 1270393060608. Its totient is φ = 799364436480.

The previous prime is 1021225615499. The next prime is 1021225615547. The reversal of 1021225615501 is 1055165221201.

It is a cyclic number.

It is not a de Polignac number, because 1021225615501 - 2¹ = 1021225615499 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021225625501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3513046 + ... + 3792616.

It is an arithmetic number, because the mean of its divisors is an integer number (39699783144).

Almost surely, 2^{1021225615501} is an apocalyptic number.

It is an amenable number.

1021225615501 is a deficient number, since it is larger than the sum of its proper divisors (249167445107).

1021225615501 is a wasteful number, since it uses less digits than its factorization.

1021225615501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280021.

The product of its (nonzero) digits is 6000, while the sum is 31.

It can be divided in two parts, 1021 and 225615501, that added together give a palindrome (225616522).

The spelling of 1021225615501 in words is "one trillion, twenty-one billion, two hundred twenty-five million, six hundred fifteen thousand, five hundred one".