1021420523501 has 16 divisors (see below), whose sum is σ = 1181919926784. Its totient is φ = 864622612224.

The previous prime is 1021420523491. The next prime is 1021420523503. The reversal of 1021420523501 is 1053250241201.

It is not a de Polignac number, because 1021420523501 - 2¹⁴ = 1021420507117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021420523503) 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, 2111765 + ... + 2549978.

It is an arithmetic number, because the mean of its divisors is an integer number (73869995424).

Almost surely, 2^{1021420523501} is an apocalyptic number.

It is an amenable number.

1021420523501 is a deficient number, since it is larger than the sum of its proper divisors (160499403283).

1021420523501 is a wasteful number, since it uses less digits than its factorization.

1021420523501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4662140.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 1021420523501 its reverse (1053250241201), we get a palindrome (2074670764702).

The spelling of 1021420523501 in words is "one trillion, twenty-one billion, four hundred twenty million, five hundred twenty-three thousand, five hundred one".