1010021351781 has 32 divisors (see below), whose sum is σ = 1535677774848. Its totient is φ = 584959380480.

The previous prime is 1010021351687. The next prime is 1010021351827. The reversal of 1010021351781 is 1871531200101.

It is not a de Polignac number, because 1010021351781 - 2³⁸ = 735143444837 is a prime.

It is a super-2 number, since 2×1010021351781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010021350781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22019851 + ... + 22065671.

It is an arithmetic number, because the mean of its divisors is an integer number (47989930464).

Almost surely, 2^{1010021351781} is an apocalyptic number.

It is an amenable number.

1010021351781 is a deficient number, since it is larger than the sum of its proper divisors (525656423067).

1010021351781 is a wasteful number, since it uses less digits than its factorization.

1010021351781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79101.

The product of its (nonzero) digits is 1680, while the sum is 30.

Adding to 1010021351781 its reverse (1871531200101), we get a palindrome (2881552551882).

The spelling of 1010021351781 in words is "one trillion, ten billion, twenty-one million, three hundred fifty-one thousand, seven hundred eighty-one".