21321011431470 has 16 divisors (see below), whose sum is σ = 51170427435600. Its totient is φ = 5685603048384.

The previous prime is 21321011431469. The next prime is 21321011431471. The reversal of 21321011431470 is 7413411012312.

It is an interprime number because it is at equal distance from previous prime (21321011431469) and next prime (21321011431471).

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 710700381049 = 21321011431470 / (2 + 1 + 3 + 2 + 1 + 0 + 1 + 1 + 4 + 3 + 1 + 4 + 7 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321011431471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355350190495 + ... + 355350190554.

It is an arithmetic number, because the mean of its divisors is an integer number (3198151714725).

Almost surely, 2^{21321011431470} is an apocalyptic number.

21321011431470 is an abundant number, since it is smaller than the sum of its proper divisors (29849416004130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21321011431470 is a wasteful number, since it uses less digits than its factorization.

21321011431470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710700381059.

The product of its (nonzero) digits is 4032, while the sum is 30.

Adding to 21321011431470 its reverse (7413411012312), we get a palindrome (28734422443782).

The spelling of 21321011431470 in words is "twenty-one trillion, three hundred twenty-one billion, eleven million, four hundred thirty-one thousand, four hundred seventy".